This afternoon mataram and surroundings occur a beautiful cloud phenomenon. Apparently this phenomenon known as Irdescence Cloud.
Phenomenon with other names "Fire Rainbows" and "Rainbow Clouds" is usually appear when the afternoon / afternoon is relatively very hot and humid.
Here is Les Cowley's explanation of the phenomenon. "What happens is a" boiling "cumulus cloud, pushing the upper air layer higher and higher as it pushes, it expands and cools.
Sometimes the humidity in the air suddenly becomes condensed into tiny droplets and eventually forms the "Cloud Cap". "" The droplets inside the cloud cap break the sunlight that creates a beautifully colored light. "