Contents
5 Details on Level 1b Product Data Set Records
The Level 1b products of the Swarm mission contains timeseries of qualityscreen, calibrated, and corrected measurements given in physical, SI units in geolocalized reference frames. Level 1b products are provided individually for each of the three satellites Swarm A, Swarm B, and Swarm C on a daily basis. The Swarm Level 1b naming convention can be illustrated in the following example:
Example illustrating the filename of the Swarm A Level 1b lowrate magnetic product MAGx_LR from 23 February 2013.
The following table identifies the Level 1b Products for Swarm. The Products with a daily period are provided covering one day of observations, i.e. 0:00:00 through 24:00:00 (UTC or GPS in case of RINEX files). The estimated sizes do not include header file information.
File Type  File Description  Rate  Period  Format  Extension 
Estimated Size
[Mbytes/file] 
MAGX_HR_1B  Magnetic vector data, high rate  ~50 Hz  daily  CDF  .cdf  340 
MAGX_LR_1B  Magnetic data, low rate  1 Hz  daily  CDF  .cdf  11 
MAGX_CA_lB  Magnetic Calibration data  1 Hz  daily  CDF  .cdf  11 
MAGXMAN_1B  Magnetic Calibration Manoeuvre report  On demand    CDF  .cdf  10^{3} 
EFIX_LP_1B  Plasma data  2 Hz  daily  CDF  .cdf  5.6 
EFIXLPI_1B  Interpolated Plasma data  1 Hz  daily  CDF  .cdf  3.0 
LP_X_CA_1B  Langmuir Probe offset calibration data  6 h  daily  CDF  .cdf  10^{3} 
MODX_SC_1B  Position and velocity  1 Hz  daily  ASCII  .sp3  20.0 
STRXATT_1B  Attitude of spacecraft  1 Hz  daily  CDF  .cdf  2.7 
GPSXNAV_1B  Onboard GPSR navigational solution  1 Hz  daily  ASCII  .sp3  13 
GPSX_RO_1B  GPS RINEX Observation data  0.1 / 1 Hz  daily  ASCII  .rnx  8.8 or 88 
GPSX_RN_1B  GPS RINEX Navigation data  2 h  daily  ASCII  .rnx  0.25 
ACCX_PR_1B  Preprocessed ACC data  1 Hz  daily  CDF  .cdf  6 
SC_XDYN_1B  Auxiliary data for precise orbit determination and acceleration modelling  1 Hz  daily  CDF  .cdf  3.7 
ASMXAUX_1B  ASM auxiliary data  50 Hz  daily  CDF  .cdf  20 
VFMXAUX_1B  VFM auxiliary data  50 Hz  daily  CDF  .cdf  40 
Table 1: Swarm Level 1b Products List
The primary Level 1b Products containing measurements of the magnetic field are MAGX_HR_1B and MAGX_LR_1B. They are largely identical with respect to the elements of the products, but the sampling rate of the data is different. MAGX_HR_1B is provided at the basic sampling rate of the vector magnetometer instrument (VFM), 50 Hz. This product is called MagH for short and is described in MAGX_HR_1B Product. The MAGX_LR_1B product contains magnetic vector data at a reduced sampling rate of 1 Hz plus the measurements of the magnetic field intensity from the scalar magnetometer (ASM) and is termed MagL for short. This is described in MAGX_LR_1B Product.
The magnetic vector elements of the MAGX_HR_1B and MAGX_LR_1B Products are provided in two reference frames: the VFM instrument frame and the orbit related NEC (NorthEastCentre) frame. See [AD7] for further details on these frames.
The magnetic Level 1b product named MAGX_CA_lB (MagC for short) contains the data used for the monitoring and estimation of the temporal VFM calibration parameters. Its content is described in MAGX_CA_1B Product. The temporal VFM parameters themselves are contained in an auxiliary data set, TCF.VFM, and stored in the magnetic products listed here. This Data Set is described in TCF.VFM Data Set.
The MAGXMAN_1B Product contains the report of the TCF.VFM records, their differences, and threshold checks when a magnetic calibration manouevre has been performed. See MAGXMAN_1B Product.
There are two additional magnetic products, ASMXAUX_1B and VFMXAUX_1B, containing the magnetic stray fields of the S/C at the ASM respectively the VFM sensor positions. They are used during special campaigns, e.g. when the ASM instrument is running in the special burst mode or vector mode configuration. Their contents are listed in ASMXAUX_1B Product and VFMXAUX_1B Product.
Early in the Swarm Mission it was recognized that the vector measurements onboard the Swarm spacecrafts suffered from an unexpected magnetic disturbance of varying strength and direction. Such disturbances are highly correlated with the Sun incident angle with respect to the spacecraft and are manifested as scalar residuals between the ASM and VFM data. The disturbance has been modelled as described in this technical note. Implemented from Product Baseline 04, the calibration parameters for the vector measurements estimated on a daily basis are replaced by the coestimated calibration adjustment parameters, and the magnetic vector disturbance, denoted with dB_{Sun} and considered as a stray field vector, is then applied. The corrected data presents such additional parameter, dB_{Sun}. MAGx_CA_1B also contains the precalibrated (i.e. without any stray field correction applied) VFM magnetic data ("B_{pre}") and the reference angles "alpha" and "beta" which represent the Spacecraft to Sun attitude angles.
The MAGX_HR_1B Product contains magnetic vector data at 50 Hz rate. The time instants of the data are determined by the VFM instrument samplings. No interpolation of the magnetic data is performed, neither to shift the measurements in time nor to fill any gaps in the VFM source data. The measurement data set record of the MAGX_HR_1B Product is described in Table 2. See also MagH Data Set Record, MDR_MAG_HR.
t  Time, UTC 
r  Position of VFM sensor in ITRF, spherical geocentric coordinates 
B_{VFM}  Magnetic field vector, VFM frame 
B_{NEC} 
Magnetic field vector, NEC frame.
Note: this is set to zero if no attitude information is available (Flags_{q} = 255) 
dB_{Sun}  Sun induced stray magnetic field correction vector subtracted from measurements, VFM frame (implemented from Product Baseline 04). 
dB_{AOCS}  AOCS magnetotorquer stray magnetic field correction vector subtracted from measurements, VFM frame. 
dB_{other}  Stray magnetic field correction vector of all other sources subtracted from measurements, VFM frame. 
B_{error} 
Error estimate on magnetic field vector, VFM frame.
Accounts for errors of commissioning including:
For further details please consult SWTNDTUGS016 
q_{NEC?CRF}  Rotation from NEC to Common Reference Frame (CRF) 
Att_{error} 
Error estimate on attitude information.
Includes effects such as number of STR camera heads supplying attitude information, possible discrepancies in provided attitude information from several heads, lack of STR attitude information (i.e. the attitude used for computing B_{NEC} is obtained by interpolation over longer arcs of S/C motion), etc. 
Flags_{B}  Flags related to the magnetic field vector measurement 
Flags_{q}  Flags related to the attitude data 
Flags_{Platform}  Flags related to the S/C platform – Bus and AOCS telemetry, position accuracy 
Table 2: Measurement Data Set Record of MAGX_HR_1B Product
The MAGX_LR_1B Product contains magnetic vector and scalar data at 1 Hz rate. The S/C data are processed to provide MAGX_LR_1B data at exact UTC seconds, i.e. both VFM vector and ASM scalar data are interpolated to yield these data. Hence, small gaps in the VFM or ASM data need not cause gaps in the product as the gaps may be filled by this interpolation. Any gaps, however, will have an impact on the error estimate of the associated product element. The measurement data set record of the MAGX_LR_1B Product is described in Table 3. See also MagL Data Set Record, MDR_MAG_LR.
t  Time, UTC 
r  Position of VFM sensor in ITRF, spherical geocentric coordinates 
F  Magnetic field intensity ("scalar magnetic field") 
dF_{AOCS}  AOCS magnetotorquer stray magnetic field intensity subtracted from scalar measurements 
dF_{other}  Stray magnetic field intensity of all other sources subtracted from scalar measurements 
F_{error} 
Error estimate on magnetic field intensity.
Accounts for errors of commissioning including:
For further details please consult SWTNDTUGS016 
B_{VFM} 
Magnetic field vector, VFM frame.
Note: this is set to zero if insufficient vector magnetometer measurements are available (Flags_{B }= 255) 
B_{NEC} 
Magnetic field vector, NEC frame.
Note: this is set to zero if insufficient vector magnetometer or attitude measurements are available (Flags_{B}= 255 or Flags_{q }= 255) 
dB_{Sun}  Sun induced stray magnetic field correction vector subtracted from measurements, VFM frame (implemented from Product Baseline 04). 
dB_{AOCS}  AOCS magnetotorquer stray magnetic field correction vector subtracted from vector measurements, VFM frame. 
dB_{other}  Stray magnetic field correction vector of all other sources subtracted from vector measurements, VFM frame. 
B_{error} 
Error estimate on magnetic field vector, VFM frame.
Accounts for errors of commissioning including:
For further details please consult SWTNDTUGS016 
Q_{NEC?CRF}  Rotation from NEC to Common Reference Frame (CRF) 
Att_{error} 
Error estimate on attitude information.
Includes effects such as number of STR camera heads supplying attitude information, possible discrepancies in provided attitude information from several heads, lack of STR attitude information (i.e. the attitude used for computing B_{NEC} is obtained by interpolation over longer arcs of S/C motion), etc. 
Flags_{F}  Flags related to the magnetic field intensity measurement 
Flags_{B}  Flags related to the magnetic field vector measurement 
Flags_{q}  Flags related to the attitude data 
Flags_{Platform}  Flags related to the S/C platform – Bus and AOCS telemetry, position accuracy 
ASM_ Freq_Dev  Deviation of actual ASM frequency calibration data from screened and filtered value 
Table 3: Measurement Data Set Record of MAGX_LR_1B Product
The MAGX_CA_1B Product contains magnetic vector and scalar data for monitoring, TCF.VFM verification, and calibration purposes. It contains raw as well as processed VFM vector measurements, VFM temperatures, and fully converted and corrected ASM measurements at 1 Hz rate. This is essentially the data used for the TCF.VFM estimation but including also the raw VFM data. The measurement data set record of the MAGX_CA_1B Product is described in Table 4. See also MagC Data Set Record, MDR_MAG_CA.
t  Time, UTC 
r  Position in ITRF, spherical geocentric coordinates 
F  Converted and corrected magnetic field intensity from ASM – not adjusted for filter group delay 
dF_{AOCS}  Stray magnetic field intensity correction of AOCS magnetotorquers 
dF_{other}  Stray magnetic field intensity correction of all other sources. 
F_{error} 
Error estimate on magnetic field intensity.
Accounts for errors of commissioning including:
For further details please consult SWTNDTUGS016 observing that F_{error} = F^{(3)}_{err} 
F_{VFM}  Converted, corrected, ASMfiltered and interpolated magnetic field intensity from VFM – also corrected for ASM filter group delay 
dt_{VFM}  Time offset, dt_{VFM} = t_{out,VFM}^{near} – t^{shifted}, where t_{out,VFM}^{near} is the timestamp of the VFM sample nearest t shifted according to the ASM filter group delay (t^{shifted} ˜ t  1.2 s) 
B  Converted and corrected magnetic field vector from VFM at time t^{shifted}+dt_{VFM} 
dB_{Sun}  Magnetic stray field vector of Sun induced stray field at VFM sensor at time t^{shifted}+dt_{VFM} (implemented from Product Baseline 04) 
dB_{AOCS}  Magnetic stray field vector of AOCS magnetotorquer at VFM sensor at time t^{shifted}+dt_{VFM} 
dB_{other}  Magnetic stray field vector of all other sources at VFM sensor at time t^{shifted}+dt_{VFM} 
B_{pre}  Precalibrated VFM magnetic field vector, VFM frame at time t^{shifted}+dt_{VFM} (implemented from Product Baseline 04) 
EU_{VFM}  Raw VFM measurement at time t^{shifted}+dt_{VFM} 
T_{CDC}  Temperature of VFM CDC at time t^{shifted}+dt_{VFM} 
T_{CSC}  Temperature of VFM CSC at time t^{shifted}+dt_{VFM} 
T_{EU}  Temperature of VFM electronic unit at time t^{shifted}+dt_{VFM} 
alpha  Solar inclination angle, rotation about y axis, S/C frame at time t^{shifted}+dt_{VFM} (implemented from Product Baseline 04) 
beta  Solar inclination angle, angleto y axis, S/C frame at time t^{shifted}+dt_{VFM} (implemented from Product Baseline 04) 
Table 4: Measurement Data Set Record of MAGX_CA_1B Product
The TCF.VFM Data Set contains the parameters of the model of the temporal changes in the VFM instrument. The TCF.VFM Data Set Record shall be included in all three magnetic products: MAGX_HR_1B, MAGX_LR_1B, and MAGX_CA_1B. This data set contains one record per day and is described in Table 5 below. See also TCF.VFM Parameter Data Set Record, ASM_VFM_IC .
t_{range}  Time interval of the VFM measurements used in estimating the parameters 
DPU_id  Specifies the active VFM DPU (Data Processing Unit) identifier 
Bias  Vector of offsets 
Scale  Vector of scale values 
Nonorth  Vector of nonorthogonality angles 
Samples  Number of samples used to estimate the parameters 
Rms  Weighted rms (rootmeansquare) value of obtained misfit between VFM and ASM measurements 
Cov  Covariances of the estimated parameters 
W_{scale}  Log10 values of actual weigths of apriori parameters (affected by e.g. maneouvers) 
Table 5: TCF.VFM Data Set Record
The MAGXMAN_1B Product contains a report on the VFM temporal parameters in response to a Magnetic Calibration manouevre stored in a VFM_MAN_RP Data Set (Table 6 below) as well as two TCF.VFM Data Set records (Table 5), the one from just before the manouevre and the one of the day of the manouevre.
Delta_bias  Vector of changes in offsets 
delta_scale  Vector of changes in scale values 
delta_nonorth  Vector of changes in nonorthogonality angles 
Threshold1_bias  Threshold 1 value for biases 
Threshold1_scale'  Threshold 1 value for scale values 
Threshold1_nonorth  Threshold 1 value for nonorthogonality angles 
Threshold2_bias  Threshold 2 value for biases 
Threshold2_scale  Threshold 2 value for scale values 
Threshold2_nonorth  Threshold 2 value for nonorthogonality angles 
Messages  Messages generated by the magnetic calibration manouevre processor 
Table 6: MAGXMAN_1B VFM_MAN_RP Data Set Record
The ASMXAUX_1B Product contains detailed information on the S/C magnetic stray fields at the ASM sensor position. The data are provided at 50 Hz at the timeinstants of the VFM measurements (for internal practical purposes); the stray field vectors are provided in the ASM sensor frame. The measurement data set record of the ASMXAUX_1B Product is described in Table 7. See also ASMXAUX_1B Data Set Record, MDR_ASMAUX.
t  Time, UTC 
dB_{AOCS}  Magnetic stray field vector of AOCS magnetotorquer coils (including magnetically induced effects of this) 
dB_{Thrust}  Magnetic stray field vector of AOCS thruster activation 
dB_{Battery}  Magnetic stray field vector of batteries charge/discharge currents 
dB_{SP}  Magnetic stray field vector of solar panel currents 
dB_{Bus}  Magnetic stray field vector of S/C bus currents 
dB_{VFM}  Magnetic stray field vector of VFM sensor 
Table 7: Measurement Data Set Record of ASMXAUX_1B Product
The VFMXAUX_1B Product contains detailed information on the S/C magnetic stray fields and the Sun induced stray field (implemented from Product Baseline 04) at the VFM sensor position. The data are provided at 50 Hz at the timeinstants of the VFM measurements; the stray field vectors are provided in the VFM sensor frame. The measurement data set record of the VFMXAUX_1B Product is described in Table 8. See also VFMXAUX_1B Data Set Record, MDR_VFMAUX.
t  Time, UTC 
dB_{Sun}  Magnetic stray field vector of Sun induced stray field (implemented from Product Baseline 04) 
dB_{AOCS}  Magnetic stray field vector of AOCS magnetotorquer coils (including magnetically induced effects of this) 
dB_{Thrust}  Magnetic stray field vector of AOCS thruster activation 
dB_{Battery}  Magnetic stray field vector of batteries charge/discharge currents 
dB_{SP}  Magnetic stray field vector of solar panel currents 
dB_{Bus}  Magnetic stray field vector of S/C bus currents 
dB_{STR}  Static magnetic stray field vector of STR Camera Head Units (CHUs) 
dB_{Static}  Static magnetic stray field vector of rest of S/C 
dB_{Ind}  Magnetically induced stray field vector, from S/C 
dB_{State}  Instrument and subsystem state dependent stray field vector, including latch valves 
Table 8: Measurement Data Set Record of VFMXAUX_1B Product
The EFIX_LP_1B Product contains plasma data from the Langimur Probe (LP) of the Electrical Field Instrument (EFI). The plasma product encompasses the plasma density and temperature. Data is provided at 2 Hz rate. The time instant are determined by the EFI instruments. No interpolation of the EFI data is performed, neither to shift the measurements in time nor to fill any gaps.
The measurement data set record of the plasma product is listed in Table 9 below. See also Plasma Data Set Record, MDR_EFI_LP
t  Time, UTC 
r  Position in ITRF, spherical geometric coordinates 
U_{orbit}  Magnitude of S/C velocity in the ITRF 
N_{e}  Plasma density 
N_{e,}_{error}  Error estimate of N_{e} 
T_{e}  Plasma electron temperature 
T_{e,error}  Error estimate of T_{elec} 
V_{s}  S/C potential 
V_{s,error}  Error estimate of V_{s} 
Flags_{LP}  Common flags of the LP data 
Flags_{Ne}  Flags of the plasma density, N_{e} 
Flags_{Te}  Flags of the electron temperature, T_{e} 
Flags_{Vs}  Flags of the S/C potential, V_{s} 
Table 9: Measurement Data Set Records of EFIX_PL_1B Product
The EFIXLPI_1B Product contains the EFIX_LP_1B plasma data interpolated at full UTC seconds, the same as the low resolution magnetic data MAG_LR.
The measurement data set record of the plasma product is listed in Table 10 below. See also Plasma Data Set Record, MDR_EFILPI
t  Time, UTC 
r  Position, ITRF, spherical geometric coordinates 
U_{orbit}  Magnitude of S/C velocity in the ITRF 
N_{e}  Plasma density 
N_{e,}_{error}  Error estimate of N_{e} 
T_{e}  Plasma electron temperature 
T_{e,error}  Error estimate of T_{elec} 
V_{s}  S/C potential 
V_{s,error}  Error estimate of V_{s} 
Flags_{LP}  Common flags of the LP data 
Flags_{Ne}  Flags of the plasma density, N_{e} 
Flags_{Te}  Flags of the electron temperature, T_{e} 
Flags_{Vs}  Flags of the S/C potential, V_{s} 
Table 10: Measurement Data Set Records of EFIX_PL_1B Product
The LP_X_CA_1B Product contains the TCF.LP Data Set records containing the LP calibration parameters determined in the Level 1b Processor from the Offset Determination Sweep Mode telemetry including the measurements themselves.
T  Time of the LP Offset Determination Sweep 
Probe1_I_Bias_Offset  Probe 1 current bias offset determined 
Probe1_I_Slope_Offset  Probe 1 current slope offset determined 
Probe1_I_Fit_Error  Error in fit of Probe 1 current sweep data 
Probe1_U_Bias_Offset  Probe 1 voltage bias offset determined 
Probe1_U_Slope_Offset  Probe 1 voltage slope offset 
Probe1_U_Fit_Error  Error in fit of Probe 1 voltage sweep data 
Probe2_I_Bias_Offset  Probe 2 current bias offset 
Probe2_I_Slope_Offset  Probe 2 current slope offset 
Probe2_I_Fit_Error  Error in fit of Probe 2 current sweep data 
Probe2_U_Bias_Offset  Probe 2 voltage bias offset determined 
Probe2_U_Slope_Offset  Probe 2 voltage slope offset 
Probe2_U_Fit_Error  Error in fit of Probe 2 voltage sweep data 
FP_I_Bias_Offset  Face Plate current bias offset 
FP_I_Slope_Offset  Face Plate current slope offset 
FP_I_Fit_Error  Error in fit of Face Plate current sweep data 
FP_U_Bias_Offset  Face Plate voltage bias offset 
FP_U_Slope_Offset  Face Plate voltage slope offset 
FP_U_Fit_Error  Error in fit of Face Plate voltage sweep data 
FP_I_offset  Vector of Face Plate current offset measurements 
FP_U_offset  Vector of Face Plate bias offset measurements 
P1_I_offset  Vector of Probe 1 current offset measurements 
P1_U_offset  Vector of Probe 1 bias offset measurements 
P1_ref_ADC2  Vector of Probe 1 reference ADC2 
P1_ground  Vector of Probe 1 ground 
P2_I_offset  Vector of Probe 2 current offset measurements 
P2_U_offset  Vector of Probe 2 bias offset measurements 
P2_ref_ADC2  Vector of Probe 2 reference ADC2 
P2_ground  Vector of Probe 2 ground 
P1_Slope  Probe 1 slope offset, determined onboard 
P1_Bias  Probe 1 bias offset, determined onboard 
P1_Error  Probe 1 fit error, determined onboard 
P2_Slope  Probe 2 slope offset, determined onboard 
P2_Bias  Probe 2 bias offset, determined onboard 
P2_Error  Probe 2 fit error, determined onboard 
Table 10: TCF.LP Data Set Record
The Swarm "position" Products consists of
The GPSX_RO_1B and GPSX_RN_1B Products store GPSR data in the RINEX 3.00 format generally used for LEO satellites. The description of the format can be found in [RD4]  rinex300.pdf. The contents of the two Products are:
The ephemeris information for Swarm is stored in three products:
See Position and Velocity Data Set Records, MDR_NAVSP3 and MDR_MODSP3 and Attitude Data Set Record, MDR_SAT_AT for detailed descriptions of the Products.
T  Time, UTC 
q  Rotation from ITRF to S/C frame (from STR) 
Flags_{q}  Flags related to the S/C attitude information (q) 
Maneuver_Id  Identification of actual S/C maneuver 
Table 12: S/C Attitude Measurement Data Set Record of STRXATT_1B Product
The ACCX_PR_1B Product contains preprocessed acceleration data. The data are not calibrated to the final level of accuracy as this is part of the Precise Orbit Determination (Level 2 processing).
The measurement data set record of the ACCX_PR_1B Product is given in Table 13 below. See also Acceleration Data Set Record, MDR_ACC_PR
t  Time, UTC, ACC linear acceleration measurement time instants, time of angular acceleration measurement is approximately t  0.12 s 
a  Preprocessed linear acceleration data, S/C frame 
a_{ang}  Preprocessed angular acceleration data, S/C frame 
p  Position of proof mass within ACC cavity, ACC frame 
p_{ang}  Angular position of proof mass within ACC cavity, ACC frame 
Temp  Temperatures of the ACC 
VpLTC1043  Voltage of positive power source of LTC1043 (housekeeping info) 
VnLTC1043  Voltage of negative power source of LTC1043 (housekeeping info) 
U_{pol}  Polarization voltage 
a_{centr}*  Centrifugal acceleration, S/C frame 
a_{GG}*  Gravity gradient acceleration, S/C frame 
Flags_{ACC}  Flags related to the ACC 
Flags_{Platform}  Flags related to the S/C platform 
The elements marked with an asterix (*) are correctional terms which may or may not have been applied to (subtracted from) the data as indicated in Flags_{ACC}. 
Table 13: Measurement Data Set Record of ACCX_PR_1B Product
The SC_XDYN_1B Product contains auxiliary data needed for precise orbit determination and nongravitational force modelling.
The data set record of the SC_XDYN_1B Product is given in the table below.
t  Time, UTC 
a_{Sun}  Acceleration due to Solar radiation pressure, S/C frame 
e_{Sun}  Direction to the Sun, unit vector, S/C frame 
A_{Xxx}  Cross sections of the S/C, orbit frame, Xxx = head, down, left, right 
K_{Earth}  Downward optical reflectivity normal 
m_{S/C}  Mass of S/C 
r_{CoG}  Position of CoG, S/C frame 
P_{Gas}  Pressure of gas tanks 
T_{Gas}  Temperature of gas tanks 
Flags_{Platform}  Flags related to the S/C platform (indicates if all inputs were available or one or more was missing) 
dt_{thr}  Thruster ontime in seconds (Start of ontime at "Timestamp"), field with 12 colmns (column 1 = ACT 1,… , column 9 = OCT 1,…) 
thr_{set}  Flag indicating which thruster branch was active (= 0 for no thrusters powered, = 1 for main units powered, = 2 for redundant units powered, =3 for both main and redundant units powered) 
f_{thr}  Nominal thrust force of activated thrusters (combined force), field with 3 columns 
This section contains the describtion of the L1b data product file containing the Swarm orbit numbers. The new Swarm Orbit Counter data file is referred with a new dedicated product type (ORBxCNT), and it provides precise Swarm orbit number information to the scientific user community.
Product identifier  AUXxORBCNT  
Definition  The Swarm orbit counter auxiliary data file provides precise Swarm orbit number information. The start of an orbit is defined as the Equator crossing of the ascending node (i.e. the northbound Equator crossing). For more information see product document.  
Units    
Quality indicator  Source of orbit number information Values: best quality is 0 and reduced quality is 1.  
Data format 
ASCII


Update rate  Daily  
Availability  Swarm Data Access  
Notes 
This section contains the detailed definitions of the Swarm Level 1b Product Data Sets.
Generally, data are stored in binary format as signed or unsigned integers with suitable (decimal) scalings to accommodate the required range and resolution of the stored quantities. This provides a simple and efficient though flexible method of storing the data.
Latitude and longitude – provided as parts of geographical position information – ranges are symmetric around zero, i.e. latitude[90..+90] and longitude[180..+180].
The following sections contain Data Set Definition tables with the following entries:
Column 
Description 

FIELD  Field name  
DESCRIPTION  Short description of the field  
UNITS 
Physical units of the field value:
eu = engineering units m = meters deg = degrees as = arc seconds (1°/3600 ˜ 0.000278°) nT = nanoTesla (10^{9} T) C = degrees Celcius s = seconds UTC = Coordinated Universal Time <blank> = no unit


DIM  Dimensions of the stored values  
TYPE 
Type of stored integer value:

FIELD 
DESCRIPTION 
UNITS 
DIM 
TYPE 
Timestamp 
Time of observation 
UTC 
1 
CDF_EPOCH 
SyncStatus 
Time synchronization status (of VFM), source and quality, see Appendix D of [AD13] 

1 
CDF_UINT2 
Latitude 
Position in ITRF – Geocentric latitude 
deg 
1 
CDF_DOUBLE 
Longitude 
Position in ITRF – Geocentric longitude 
deg 
1 
CDF_DOUBLE 
Radius 
Position in ITRF – Radius 
m 
1 
CDF_DOUBLE 
B_VFM 
Magnetic field vector, VFM frame 
nT 
3 
CDF_DOUBLE 
B_NEC 
Magnetic field vector, NEC frame, zero if Flags_q = 255 
nT 
3 
CDF_DOUBLE 
dB_Sun 
Magnetic stray field correction vector of Sun induced stray field, VFM frame (implemented from Product Baseline 04) 
nT 
3 
CDF_DOUBLE 
dB_AOCS 
Magnetic stray field correction vector of AOCS magnetotorquer coils, VFM frame 
nT 
3 
CDF_DOUBLE 
dB_other 
Magnetic stray field correction vector of all other sources, VFM frame 
nT 
3 
CDF_DOUBLE 
B_error 
Error estimates on magnetic field, VFM frame 
nT 
3 
CDF_DOUBLE 
q_NEC_CRF 
Quaternion, transformation: NEC ? CRF 

4 
CDF_DOUBLE 
Att_error 
Error estimates on attitude information 
mdeg 
1 
CDF_DOUBLE 
Flags_B 
Flags characterizing the magnetic field measurement, see Table 14 

1 
CDF_UINT1 
Flags_q 
Flags characterizing the attitude information, see Table 14 

1 
CDF_UINT1 
Flags_Platform 
Flags characterizing the S/C platform information, see Table 14 

1 
CDF_UINT2 
The values of the Flags_xxx fields of MDR_MAG_HR are given in the following table.
Flag 
Value 
Description 
Flags_B 
0 
Magnetic field measurements (VFM) nominal 
1 
ASM instrument turned off 

2 
Outlier detected, gap, or not enough VFM temperature data for filtering 

3 
Both conditions (values) 1 and 2 above 

4 
Suspiciuos VFM sample 

57 
Combination (sum) of values 14 

8 
Discrepancy between ASM and VFM measurements 

10,12,14 
Combination (sum) of values 2, 4, and 8 

Flags_q 
0 
Attitude information (STR) nominal 
1 
Lack of 1 or 2 attitudes of CHU1 in 4 nearest STR samples 

2 
Lack of 1 or 2 attitudes of CHU2 in 4 nearest STR samples 

3 
Lack of 1 or 2 attitudes of CHU3 in 4 nearest STR samples 

4 
Lack of 3 or 4 attitudes of CHU1 in 4 nearest STR samples 

5 
Lack of 3 or 4 attitudes of CHU2 in 4 nearest STR samples 

6 
Lack of 3 or 4 attitudes of CHU3 in 4 nearest STR samples 

7 
Not currently used 

8 
Onground aberrational correction of any attitude sample among 4 nearest STR samples. 

914 
As 17 above with onground aberrational correction of any attitude sample among 4 nearest STR samples. 

15 
Not currently used 

16 
CHU1 obscured by bright object in 4 nearest STR samples (all 4 CHU1 samples invalid), CHU2 and CHU3 ok 

17 
CHU2 obscured by bright object in 4 nearest STR samples (all 4 CHU2 samples invalid) , CHU1 and CHU3 ok 

18 
CHU3 obscured by bright object in 4 nearest STR samples (all 4 CHU3 samples invalid) , CHU1 and CHU2 ok 

19 
Lack of 24 attitudes of CHU1 and CHU2 in 4 nearest STR samples, but not both simultaneously 

20 
Lack of 24 attitudes of CHU1 and CHU3 in 4 nearest STR samples, but not both simultaneously 

21 
Lack of 24 attitudes of CHU2 and CHU3 in 4 nearest STR samples, but not both simultaneously 

22 
Lack of 34 attitudes of CHU1, CHU2, and CHU3 in 4 nearest STR samples, but not two simultaneously 

23 
Not currently used 

2430 
As 1622 above with onground aberrational correction. 

31 
Not currently used 

32 
1 or 2 attitudes based on CHU1 alone (CHU2 and CHU3 missing) in 4 nearest STR samples 

33 
1 or 2 attitudes based on CHU2 alone in 4 nearest STR samples 

34 
1 or 2 attitudes based on CHU3 alone in 4 nearest STR samples 

35 
2 attitudes based on single, intermittent CHU alone in 4 nearest STR samples 

3639 
Not currently used 

4043 
As 3235 above with onground aberrational correction. 

4447 
Not currently used 

48 
1 attitude sample missing among 4 nearest STR samples (data gap) 

49 
2 attitude samples missing among 4 nearest STR samples 

50 
3 or more attitude samples missing among 4 nearest STR samples 

51 
3 or 4 attitudes based on CHU1 alone in 4 nearest STR samples 

52 
3 or 4 attitudes based on CHU2 alone in 4 nearest STR samples 

53 
3 or 4 attitudes based on CHU3 alone in 4 nearest STR samples 

54 
3 or 4 attitudes based on single, intermittent CHU alone in 4 nearest STR samples 

55 
Not currently used 

5662 
As 4854 above with onground aberrational correction. 

63254 
Not currently used 

255 
Not enough STR data for generating attitude information. 

Flags_Platform 
0 
Platform telemetry nominal (no missing or suspicious data) 
1 
Thruster latch valves open, thrusters not activated 

2 
Thrusters activated 

4 
Gap in Bus telemetry, 1 or 2 samples missing 

57 
Used for combinations (sum) of values 1, 2, and 4 

8 
Outlier detected in Bus currents 

915 
Used for combinations (sum) of values 18 

16 
Not enough data for filtering Bus currents (due to large gap or jump in data) 

1731 
Used for combinations (sum) of values 116 

32 
Change in instrument state according to Bus telemetry 

3363 
Used for combinations (sum) of values 132 

64 
No Bus telemetry available (for extended period) 

6567 
Used for combinations (sum) of values 1, 2 and 64 

128 
Gap in AOCS telemetry 

129195 
Used for combinations (sum) of values 167 and 128 

256 
Position information based on onboard (GPSR) navigational solution 

257323 384451 
Used for combinations (sum) of values 167, 128, and 256 
Table 14: Flag Values of MDR_MAG_HR
FIELD 
DESCRIPTION 
UNITS 
DIM 
TYPE 
Timestamp 
Time of observation 
UTC 
1 
CDF_EPOCH 
SyncStatus 
Time synchronization status (of VFM), source and quality, see Appendix D of [AD13] 

1 
CDF_UINT2 
Latitude 
Position in ITRF – Geocentric latitude 
deg 
1 
CDF_DOUBLE 
Longitude 
Position in ITRF – Geocentric longitude 
deg 
1 
CDF_DOUBLE 
Radius 
Position in ITRF – Radius 
m 
1 
CDF_DOUBLE 
F 
Magnetic field intensity, zero if Flags_F = 255 
nT 
1 
CDF_DOUBLE 
dF_AOCS 
Magnetic stray field correction intensity of AOCS magnetotorquer coils 
nT 
1 
CDF_DOUBLE 
dF_other 
Magnetic stray field correction intensity of all other sources 
nT 
1 
CDF_DOUBLE 
F_error 
Error estimate on magnetic field intensity 
nT 
1 
CDF_DOUBLE 
B_VFM 
Magnetic field vector, VFM frame, zero if Flags_B = 255 
nT 
3 
CDF_DOUBLE 
B_NEC 
Magnetic field vector, NEC frame, zero if Flags_B = 255 or Flags_q = 255 
nT 
3 
CDF_DOUBLE 
dB_Sun 
Magnetic stray field vector of Sun induced stray field, VFM frame (implemented from Product Baseline 04) 
nT 
3 
CDF_DOUBLE 
dB_AOCS 
Magnetic stray field correction vector of AOCS magnetotorquer coils, VFM frame 
nT 
3 
CDF_DOUBLE 
dB_other 
Magnetic stray field correction vector of all other sources, VFM frame 
nT 
3 
CDF_DOUBLE 
B_error 
Error estimates on magnetic field, VFM frame 
nT 
3 
CDF_DOUBLE 
q_NEC_CRF 
Quaternion, transformation: NEC ? CRF 

4 
CDF_DOUBLE 
Att_error 
Error estimates on attitude information 
mdeg 
1 
CDF_DOUBLE 
Flags_F 
Flags characterizing the magnetic field intensity measurement (F), see Table 15 

1 
CDF_UINT1 
Flags_B 
Flags characterizing the magnetic field vector measurement (B_VFM, B_NEC), see Table 15 

1 
CDF_UINT1 
Flags_q 
Flags characterizing the attitude information, see Table 14 

1 
CDF_UINT1 
Flags_Platform 
Flags characterizing the S/C platform information, see Table 14 

1 
CDF_UINT2 
ASM_Freq_Dev 
ASM frequency calibration data deviation 

1 
CDF_DOUBLE 
The values of the Flags_q and Flags_Platform fields of MDR_MAG_LR are as for the MDR_MAG_HR given in Table 14; the values of Flags_F and Flags_B are given in the following table.
Flag 
Value 
Description 
Flags_F 
0 
Magnetic field intensity measurements (ASM) nominal (scalar mode) 
1 
ASM running in vector mode 

2 
Outlier detected, gap, or not enough ASM frequency calibration data for filtering 

3 
Combination (sum) of values 1 and 2 

4 
At least one of 4 nearest ASM samples is suspicious 

57 
Combination (sum) of values 14 

8 
Within 8 seconds after ASM restart, loss of magnetic field lock, or telemetry gap 

915 
Combination (sum) of values 18 

16 
Discrepancy between ASM and VFM measurements – at least one of the 4 nearest ASM samples differ from VFM measurements 

1731 
Combination (sum) of values 116 

32 
Gap in 4 nearest ASM samples 

3363 
Combination (sum) of values 132 

64 
VFM instrument turned off, i.e. no stray field corrections 

6579 96111 
Combination (sum) of value 64 with values 115 and 3247 

255 
Not enough ASM samples to generate F. 

Flags_B 
0 
Magnetic field vector measurements (VFM) nominal 
1 
ASM instrument turned off 

2 
Outlier detected, gap, or not enough VFM temperature data for filtering 

3 
Both conditions (values) 1 and 2 above 

4 
More than 5 suspiciuos VFM samples in 2 seconds surrounding record time 

57 
Combination (sum) of values 14 

8 
Discrepancy between ASM and VFM measurements 

10,12,14 
Combination (sum) of values 2, 4, 8 

16 
Gap in VFM samples in surrounding 2 seconds (by rejection or missing data) 

1724 26,28,30 
Combination (sum) of values 1, 2, 4, 8, and 16 (but not 1 and 8 simultaneously) 

255 
Not enough VFM samples to generate B_VFM and B_NEC 
Table 15: Flags_F and Flags_B Values of MDR_MAG_LR
FIELD 
DESCRIPTION 
UNITS 
DIM 
TYPE 
Timestamp 
Time of observation 
UTC 
1 
CDF_EPOCH 
SyncStatus 
Time synchronization status (of VFM), source and quality, see Appendix D of [AD13] 

1 
CDF_UINT2 
Latitude 
Position in ITRF – Geocentric latitude 
deg 
1 
CDF_DOUBLE 
Longitude 
Position in ITRF – Geocentric longitude 
deg 
1 
CDF_DOUBLE 
Radius 
Position in ITRF – Radius 
m 
1 
CDF_DOUBLE 
F 
Magnetic field intensity, converted and corrected – not adjusted for filter group delay 
nT 
1 
CDF_DOUBLE 
dF_AOCS 
Magnetic stray field correction intensity of AOCS magnetotorquer coils 
nT 
1 
CDF_DOUBLE 
dF_other 
Magnetic stray field correction intensity of all other sources 
nT 
1 
CDF_DOUBLE 
F_error 
Error estimate on magnetic field intensity 
nT 
1 
CDF_DOUBLE 
F_VFM 
Magnetic field intensity from the VFM instrument, converted and corrected 
nT 
1 
CDF_DOUBLE 
B 
Magnetic field vector, VFM frame, time t^{shifted}+dt 
nT 
3 
CDF_DOUBLE 
dB_Sun 
Magnetic stray field correction vector of Sun induced stray field, VFM frame, time t^{shifted}+dt_VFM (implemented from Product Baseline 04) 
nT 
3 
CDF_DOUBLE 
dB_AOCS 
Magnetic stray field correction vector of AOCS magnetotorquer coils, VFM frame, time t^{shifted}+dt_VFM 
nT 
3 
CDF_DOUBLE 
dB_other 
Magnetic stray field correction vector of all other sources, VFM frame, time t^{shifted}+dt_VFM 
nT 
3 
CDF_DOUBLE 
B_pre 
Precalibrated VFM magnetic field vector, VFM frame, time t^{shifted}+dt_VFM (implemented from Product Baseline 04) 
nT 
3 
CDF_DOUBLE 
EU_VFM 
Raw VFM measuremet, time t^{shifted}+dt_VFM 
eu 
3 
CDF_DOUBLE 
T_CDC 
Temperature of VFM CDC, time t^{shifted}+dt_VFM 
°C 
1 
CDF_DOUBLE 
T_CSC 
Temperature of VFM CSC, time t^{shifted}+dt_VFM 
°C 
1 
CDF_DOUBLE 
T_EU 
Temperature of VFM EU, time t^{shifted}+dt_VFM 
°C 
1 
CDF_DOUBLE 
dt_VFM 
Time offset of VFM measurement 
s 
1 
CDF_DOUBLE 
alpha 
Solar inclination angle, rotation about y axis, S/C frame, time t^{shifted}+dt_VFM (implemented from Product Baseline 04) 
deg 
1 
CDF_DOUBLE 
beta 
Solar inclination angle, angleto y axis, S/C frame, time t^{shifted}+dt_VFM (implemented from Product Baseline 04) 
deg 
1 
CDF_DOUBLE 
FIELD 
DESCRIPTION 
UNITS 
DIM 
TYPE 
Timestamp 
Time of observation 
UTC 
1 
CDF_EPOCH 
Timestamp_end 
Time of last observation 
UTC 
1 
CDF_EPOCH 
Primary_EU 
Id of active VFM DPU, 1 = primary, 3 = secondary 

1 
CDF_INT4 
Bias 
Vector of estimated offsets 
nT 
3 
CDF_DOUBLE 
Scale 
Vector of estimated sensitivities 

3 
CDF_DOUBLE 
Non_orth 
Vector of estimated nonorthogonalities 
mdeg 
3 
CDF_DOUBLE 
Samples 
Number of samples used in estimation 

1 
CDF_UNIT4 
Rms 
Weighted rms value of residuals after estimation 
nT 
1 
CDF_DOUBLE 
Cov_row1 
Covariances of estimated parameters – lower left part of covariance matrix  row 1 

1 
CDF_DOUBLE 
Cov_row2 
Covariances of estimated parameters – lower left part of covariance matrix  row 2 

2 
CDF_DOUBLE 
Cov_row3 
Covariances of estimated parameters – lower left part of covariance matrix  row 3 

3 
CDF_DOUBLE 
Cov_row4 
Covariances of estimated parameters – lower left part of covariance matrix  row 4 

4 
CDF_DOUBLE 
Cov_row5 
Covariances of estimated parameters – lower left part of covariance matrix  row 5 

5 
CDF_DOUBLE 
Cov_row6 
Covariances of estimated parameters – lower left part of covariance matrix  row 6 

6 
CDF_DOUBLE 
Cov_row7 
Covariances of estimated parameters – lower left part of covariance matrix  row 7 

7 
CDF_DOUBLE 
Cov_row8 
Covariances of estimated parameters – lower left part of covariance matrix  row 8 

8 
CDF_DOUBLE 
Cov_row9 
Covariances of estimated parameters – lower left part of covariance matrix  row 9 

9 
CDF_DOUBLE 
W_scale 
Log (base 10) values of actual scaling of weigths of apriori information 

9 
CDF_DOUBLE 
FIELD 
DESCRIPTION 
UNITS 
DIM 
TYPE 
Timestamp 
Time of observation 
UTC 
1 
CDF_EPOCH 
SyncStatus 
Time synchronization status (of VFM), source and quality, see Appendix D of [AD13] 

1 
CDF_UINT2 
dB_AOCS 
Magnetic stray field vector of AOCS magnetotorquer coils, ASM frame 
nT 
3 
CDF_DOUBLE 
dB_Thrust 
Magnetic stray field vector of AOCS thruster activations, ASM frame 
nT 
3 
CDF_DOUBLE 
dB_Battery 
Magnetic stray field vector of battery currents, ASM frame 
nT 
3 
CDF_DOUBLE 
dB_SP 
Magnetic stray field vector of solar panels currents, ASM frame 
nT 
3 
CDF_DOUBLE 
dB_Bus 
Magnetic stray field vector of S/C bus currents, ASM frame 
nT 
3 
CDF_DOUBLE 
dB_VFM 
Magnetic stray field vector of VFM sensor, ASM frame 
nT 
3 
CDF_DOUBLE 
dB_Static 
Static magnetic stray field vector of S/C platform, ASM frame 
nT 
3 
CDF_DOUBLE 
dB_Ind 
Magnetically induced stray field vector of S/C platform, ASM frame 
nT 
3 
CDF_DOUBLE 
dB_State 
Instrument and subsystem state dependent magnetic stray field vector, ASM frame 
nT 
3 
CDF_DOUBLE 
FIELD 
DESCRIPTION 
UNITS 
DIM 
TYPE 
Timestamp 
Time of observation 
UTC 
1 
CDF_EPOCH 
SyncStatus 
Time synchronization status (of VFM), source and quality, see Appendix D of [AD13] 

1 
CDF_UINT2 
dB_Sun 
Magnetic field correction vector of Sun induced stray magnetic field, VFM frame (implemented from Product Baseline 04) 
nT 
3 
CDF_DOUBLE 
dB_AOCS 
Magnetic stray field vector of AOCS magnetotorquer coils, VFM frame 
nT 
3 
CDF_DOUBLE 
dB_Thrust 
Magnetic stray field vector of AOCS thruster activations, VFM frame 
nT 
3 
CDF_DOUBLE 
dB_Battery 
Magnetic stray field vector of battery currents, VFM frame 
nT 
3 
CDF_DOUBLE 
dB_SP 
Magnetic stray field vector of solar panels currents, VFM frame 
nT 
3 
CDF_DOUBLE 
dB_Bus 
Magnetic stray field vector of S/C bus currents, VFM frame 
nT 
3 
CDF_DOUBLE 
dB_STR 
Magnetic stray field vector of STR CHUs, VFM frame 
nT 
3 
CDF_DOUBLE 
dB_Static 
Static magnetic stray field vector of S/C platform, VFM frame 
nT 
3 
CDF_DOUBLE 
dB_Ind 
Magnetically induced stray field vector of S/C platform, VFM frame 
nT 
3 
CDF_DOUBLE 
dB_State 
Instrument and subsystem state dependent magnetic stray field vector, VFM frame 
nT 
3 
CDF_DOUBLE 
FIELD 
DESCRIPTION 
UNITS 
DIM 
TYPE 
Timestamp 
Time of observation 
UTC 
1 
CDF_EPOCH 
delta_t 
Time difference between first observation in the two ASM_VFM_IC records 
s 
1 
CDF_DOUBLE 
delta_bias 
Differences in estimated offsets 
nT 
3 
CDF_DOUBLE 
delta_scale 
Differences in estimated scale values 

3 
CDF_DOUBLE 
delta_non orth 
Differences in estimated nonorthogonality angles 
mdeg 
3 
CDF_DOUBLE 
Threshold1_bias 
Threshold 1 value, bias 
nT 
1 
CDF_DOUBLE 
Threshold1_scale 
Threshold 1 value, scale 

1 
CDF_DOUBLE 
Threshold1_nonorth 
Threshold 1 value, nonorthogonality 
mdeg 
1 
CDF_DOUBLE 
Threshold2_bias 
Threshold 2 value, bias 
nT 
1 
CDF_DOUBLE 
Threshold2_scale 
Threshold 2 value, scale 

1 
CDF_DOUBLE 
Threshold2_nonorth 
Threshold 2 value, nonorthogonality 
mdeg 
1 
CDF_DOUBLE 
Messages 
Number of messages, the Message_ID field below is repeated Messages times 

1 
CDF_INT4 
Message_ID 
Message id, see Table 16 below 

1 
CDF_INT4 
The values of Message_ID are given in the following table.
Value 
Description 
1 
All changes within threshold1. CCDB remains unchanged. 
10 
All changes within threshold2, at least one change above threshold1. CCDB parameters to be updated with linear change in time. 
100 
At least on change above threshold2. Furhter investigations needed. CCDB remains unchanged until further notice. 
TBD 
Additional messages, warnings, and errors 
Table 16: VFM_MAN_RP Message_ID Values
FIELD 
DESCRIPTION 
UNITS 
DIM 
TYPE 
Timestamp 
Timestamp of the LP measurement 
UTC 
1 
CDF_EPOCH 
SyncStatus 
Time synchronization status (of LP), source and quality, see Appendix D of SWRSDSCSY0007 

1 
CDF_UINT2 
Latitude 
Position in ITRF – Geocentric latitude 
deg 
1 
CDF_DOUBLE 
Longitude 
Position in ITRF – Geocentric longitude 
deg 
1 
CDF_DOUBLE 
Radius 
Position in ITRF – Radius 
m 
1 
CDF_DOUBLE 
U_orbit 
Magnitude of spacecraft velocity in the ITRF  m/s  1  CDF_DOUBLE 
Ne 
Plasma density (electron) 
cm^{3} 
1 
CDF_DOUBLE 
Ne_error 
Error of the plasma density estimate 
cm^{3} 
1 
CDF_DOUBLE 
Te 
Plasma electron temperature 
K 
1 
CDF_DOUBLE 
Te_error 
Error of the electron temperature estimate 
K 
1 
CDF_DOUBLE 
Vs 
Spacecraft potential 
V 
1 
CDF_DOUBLE 
Vs_error 
Error of the spacecraft potential estimate 
V 
1 
CDF_DOUBLE 
Flags_LP 
Flags indicating the source of measurements, see Table 64 of SWRSDSCSY0007 

1 
CDF_UINT1 
Flags_Ne 
Flags characterizing the plasma density measurement, see Table 64 of SWRSDSCSY0007 

1 
CDF_UINT1 
Flags_Te 
Flags characterizing the electron temperature measurement, see Table 64 of SWRSDSCSY0007 

1 
CDF_UINT1 
Flags_Vs 
Flags characterizing the spacecraft potential measurement, see Table 64 of SWRSDSCSY0007 

1 
CDF_UINT1 
FIELD 
DESCRIPTION 
UNITS 
DIM 
TYPE 
Timestamp 
Exact UTC second of the interpolated LP measurement 
UTC 
1 
CDF_EPOCH 
SyncStatus 
Time synchronization status (of LP), source and quality, see Appendix D of SWRSDSCSY0007 

1 
CDF_UINT2 
Latitude 
Position in ITRF – Geocentric latitude 
deg 
1 
CDF_DOUBLE 
Longitude 
Position in ITRF – Geocentric longitude 
deg 
1 
CDF_DOUBLE 
Radius 
Position in ITRF – Radius 
m 
1 
CDF_DOUBLE 
U_orbit 
Magnitude of spacecraft velocity in the ITRF  m/s  1  CDF_DOUBLE 
Ne 
Plasma density (electron) 
cm^{3} 
1 
CDF_DOUBLE 
Ne_error 
Error of the plasma density estimate 
cm^{3} 
1 
CDF_DOUBLE 
Te 
Plasma electron temperature 
K 
1 
CDF_DOUBLE 
Te_error 
Error of the electron temperature estimate 
K 
1 
CDF_DOUBLE 
Vs 
Spacecraft potential 
V 
1 
CDF_DOUBLE 
Vs_error 
Error of the spacecraft potential estimate 
V 
1 
CDF_DOUBLE 
Flags_LP 
Flags indicating the source of measurements, see Table 64 of SWRSDSCSY0007 

1 
CDF_UINT1 
Flags_Ne 
Flags characterizing the plasma density measurement, see Table 64 of SWRSDSCSY0007 

1 
CDF_UINT1 
Flags_Te 
Flags characterizing the electron temperature measurement, see Table 64 of SWRSDSCSY0007 

1 
CDF_UINT1 
Flags_Vs 
Flags characterizing the spacecraft potential measurement, see Table 64 of SWRSDSCSY0007 

1 
CDF_UINT1 
FIELD 
DESCRIPTION 
UNITS 
DIM 
TYPE 
Timestamp 
Time of observation 
UTC 
1 
CDF_EPOCH 
SyncStatus 
Time synchronization status, source and quality, see Appendix D of [AD13] 

1 
CDF_UINT2 
Probe1_I_Bias_Offset 
Probe 1 current bias offset 
V 
1 
CDF_DOUBLE 
Probe1_I_Slope_Offset 
Probe 1 current slope offset 
V 
1 
CDF_DOUBLE 
Probe1_I_Fit_Error 
Probe 1 current sweep fit error 
V 
1 
CDF_DOUBLE 
Probe1_U_Bias_Offset 
Probe 1 voltage bias offset 
V 
1 
CDF_DOUBLE 
Probe1_U_Slope_Offset 
Probe 1 voltage slope offset 
V 
1 
CDF_DOUBLE 
Probe1_U_Fit_Error 
Probe 1 voltage sweep fit error 
V 
1 
CDF_DOUBLE 
Probe2_I_Bias_Offset 
Probe 2 current bias offset 
V 
1 
CDF_DOUBLE 
Probe2_I_Slope_Offset'''' 
Probe 2 current slope offset 
V 
1 
CDF_DOUBLE 
Probe2_I_Fit_Error'''' 
Probe 2 current sweep fit error 
V 
1 
CDF_DOUBLE 
Probe2_U_Bias_Offset 
Probe 2 voltage bias offset 
V 
1 
CDF_DOUBLE 
Probe2_U_Slope_Offset 
Probe 2 voltage slope offset 
V 
1 
CDF_DOUBLE 
Probe2_U_Fit_Error 
Probe 2 voltage sweep fit error 
V 
1 
CDF_DOUBLE 
FP_I_Bias_Offset 
Face Plate current bias offset 
V 
1 
CDF_DOUBLE 
FP_I_Slope_Offset'''' 
Face Plate current slope offset 
V 
1 
CDF_DOUBLE 
FP_I_Fit_Error'''' 
Face Plate current sweep fit error 
V 
1 
CDF_DOUBLE 
FP_U_Bias_Offset 
Face Plate voltage bias offset 
V 
1 
CDF_DOUBLE 
FP_U_Slope_Offset 
Face Plate voltage slope offset 
V 
1 
CDF_DOUBLE 
FP_U_Fit_Error 
Face Plate voltage sweep fit error 
V 
1 
CDF_DOUBLE 
FP_I_offset 
Face Plate current offset measurements 
eu 
32 
CDF_INT2 
FP_U_offset 
Face Plate bias offset measurements 
eu 
32 
CDF_INT2 
P1_I_offset 
Probe 1 current offset measurements 
eu 
32 
CDF_INT2 
P1_U_offset 
Probe 1 bias offset measurements 
eu 
32 
CDF_INT2 
P1_ref_ADC2 
Probe 1 reference ADC2 
eu 
32 
CDF_INT2 
P1_ground 
Probe 1 ground 
eu 
32 
CDF_INT2 
P2_I_offset 
Probe 2 current offset measurements 
eu 
32 
CDF_INT2 
P2_U_offset 
Probe 2 bias offset measurements 
eu 
32 
CDF_INT2 
P2_ref_ADC2 
Probe 2 reference ADC2 
eu 
32 
CDF_INT2 
P2_ground 
Probe 2 ground 
eu 
32 
CDF_INT2 
P1_Slope 
Probe 1 slope offset, determined onboard 
V 
1 
CDF_DOUBLE 
P1_Bias 
Probe 1 bias offset, determined onboard 
V 
1 
CDF_DOUBLE 
P1_Error 
Probe 1 sweep fit error, determined onboard 
V 
1 
CDF_DOUBLE 
P2_Slope 
Probe 2 slope offset, determined onboard 
V 
1 
CDF_DOUBLE 
P2_Bias 
Probe 2 bias offset, determined onboard 
V 
1 
CDF_DOUBLE 
P2_Error 
Probe 2 sweep fit error, determined onboard 
V 
1 
CDF_DOUBLE 
FIELD 
DESCRIPTION 
UNITS 
DIM 
TYPE 
Timestamp 
Time of observation 
UTC 
1 
CDF_EPOCH 
x0 
Estimate of the x position of the image center. Sensor order: H, V (applies to all below) 

2 
CDF_DOUBLE 
y0 
Estimate of the y position of the image center. 

2 
CDF_DOUBLE 
phi0 
Estimate of mean azimuthal position of data points. 
deg 
2 
CDF_DOUBLE 
r0 
Radius of bestfit circle 

2 
CDF_DOUBLE 
rms'''' 
Goodness of fit (rms error) 

2 
CDF_DOUBLE 
Samples'''' 
Number of data points used in fit 

2 
CDF_UINT4 
Success 
Flag indicating whether fit succeeded or not, 1 = success 

2 
CDF_UINT2 
r1 
Average of r1 

2 
CDF_DOUBLE 
r1_r1 
Average of r1*r1 

2 
CDF_DOUBLE 
r1_y2 
Average of r1*y2 

2 
CDF_DOUBLE 
U_SC 
Average of U_SC {spacecraft potential} 
V 
2 
CDF_DOUBLE 
dVgf 
Average of (Vg – Vf) {deflection minus faceplate voltage} 
V 
2 
CDF_DOUBLE 
Qram 
Average of (v_SC – v_{cr})^{2} {ramdirected plasma flow velocity, squared} 
m^{2}/s^{2} 
2 
CDF_UINT4 
r1_samples 
Number of samples used in averages 

2 
CDF_UINT4 
These Data Set records forms ASCII files following the Extended Standard Product 3 Orbit Format (SP3c), cf [RD5]. These files may be compressed thereby reducing their size significantly. The "Number of Records" in the table in Product File refers to the number of observations in one SP3 file.
FIELD 
DESCRIPTION 
UNITS 
DIM 
TYPE 
Timestamp 
Time of observation 
UTC 
1 
CDF_EPOCH 
SyncStatus 
Time synchronization status (of STR), source and quality, see Appendix D of [AD13] 

1 
CDF_UINT2 
q 
Quaternion, transformation: ITRF ? S/C 

4 
CDF_DOUBLE 
Flags_q 
Flags characterizing the attitude information, see Table 14 

1 
CDF_UINT1 
Maneuver_Id 
Current maneuver identification code 

1 
CDF_UINT1 
These Data Set records forms the RINEX observations files according to [RD4]. The format is thouroughly described in this document, rinex300.pdf, in particular Section 2 and Appendix A.
These Data Set records deviate from the RINEX GPS navigation files defined in [RD4]. The format is thouroughly described in this document, rinex300.pdf, in particular Section 2 and Appendix A.
FIELD 
DESCRIPTION 
UNITS 
DIM 
TYPE 
Timestamp 
Time of observation 
UTC 
1 
CDF_EPOCH 
SyncStatus 
Time synchronization status, source and quality, see Appendix D of [AD13] 

1 
CDF_UINT2 
a 
Nongravitational, linear acceleration, partly converted, S/C frame 
m/s^{2} 
3 
CDF_DOUBLE 
a_ang 
Angular acceleration, partly converted, S/C frame 
rad/s^{2} 
3 
CDF_DOUBLE 
p 
Position of proof mass within cavity, ACC frame 
m 
3 
CDF_DOUBLE 
p_ang 
Angular position of proof mass within cavity, ACC frame 
rad 
3 
CDF_DOUBLE 
Temp 
Temperatures of ACC 
°C 
6 
CDF_DOUBLE 
VpLTC1043 
Positive voltage of LTC1043 
V 
1 
CDF_DOUBLE 
VnLTC1043 
Negative voltage of LTC1043 
V 
1 
CDF_DOUBLE 
U_pol 
Polarization voltage 
V 
1 
CDF_DOUBLE 
a_centr 
Centrifugal acceleration, S/C frame 
m/s^{2} 
3 
CDF_DOUBLE 
a_GG 
Gravity gradient acceleration, S/C frame 
m/s^{2} 
3 
CDF_DOUBLE 
Flags_ACC 
Flags characterizing the ACC, see Table 18 

1 
CDF_UINT2 
Flags_Platform 
Flags characterizing the S/C platform information, see Table 18 

1 
CDF_UINT2 
Maneuver_Id 
Current maneuver identification code 

1 
CDF_UINT1 
[1] "Observation" refers to the linear acceleration measurement; the angular acceleration measurement is approximately 0.12 s before.
Flag 
Value 
Description 
Flags_ACC 
0 
Accelerometer measurements nominal (no corrections applied) 
1 
a_Sun correction applied 

4 
a_GG correction applied 

8 
a_centr correction applied 

16 
U_{Pol} detected as outlier 

32 
Not used 

64 
Temperature detected as outlier 

128 
Proof mass angular position (p_{ang}) detected as outlier 

256 
Proof mass linear position (p) detected as outlier 

512 
Angular acceleration (a_{ang}) detected as outlier 

1024 
Linear acceleration (a) detected as outlier 

5…2047 
All combinations of the values above 

Flags_Platform 
0 
Platform telemetry nominal 
4 
Heater switching 

5,6 
Combination (sum) of values 1 and 2 with 4 

8 
Level 1a.Bus.State telemetry missing 

9,10 
Combination (sum) of values 1 and 2 with 8 

16 
Thruster firing 

17…26 
Combination (sum) of values 1/2, 4/8 and 16 

32 
Level 1a.AOCS.Thru_HK telemetry missing 

33…42 
Combination (sum) of values 1/2, 4/8 and 32 
Table 18: Acceleration Product Flags
FIELD 
DESCRIPTION 
UNITS 
DIM 
TYPE 

Timestamp 
Time of observation 
UTC 
1 
CDF_EPOCH 

SyncStatus 
Time synchronization status, source and quality, see Appendix D of [AD13] 

1 
CDF_UINT2 

a_Sun 

m/s^{2} 
3 
CDF_DOUBLE 


Direction to the Sun, unit vector, S/C frame 

3 
CDF_DOUBLE 

m_SC 
Actual mass of S/C 
kg 
1 
CDF_DOUBLE 

r_CoG 
Center of Gravity, S/C frame 
m 
3 
CDF_DOUBLE 

A_head 
Cross section area normal, front 
m^{2} 
3 
CDF_DOUBLE 

A_right 
Cross section area normal, right (+Y) 
m^{2} 
3 
CDF_DOUBLE 

A_left 
Cross section area normal, left (Y) 
m^{2} 
3 
CDF_DOUBLE 

A_down 
Cross section area normal, down 
m^{2} 
3 
CDF_DOUBLE 


Downward optical reflectivity normal 
m^{2} 
3 
CDF_DOUBLE 

P_Gas 
Pressure of gas tanks 
Pa 
2 
CDF_DOUBLE 

T_Gas 
Temperature of gas tanks 
°C 
2 
CDF_DOUBLE 

Flags_Platform 
Flags characterizing the S/C platform information, see Table 18 

1 
CDF_UINT2 

dt_thr 
Thruster ontime in seconds (Start of ontime at "Timestamp"), field with 12 colmns (column 1 = ACT 1, … , column 9 = OCT1, …) 
s 
1 
CDF_DOUBLE 

thr_set  Flag indicating which thruster branch was active (= 0 for no thrusters powered, = 1 for main units powered, = 2 for redundant units powered, =3 for both main and redundant units powered)  1 
CDF_UINT2 

f_thr  Nominal thrust force of activated thrusters* (combined force), field with 3 columns  mN  3  CDF_DOUBLE 