Those shots are gorgeous, the geometries are so fascinating!!
I have to spend a few lines on air contrails
A Review of Cloud Seeding Experiments to Enhance Precipitation and Some New Prospects
In this article you will find a detailed explanation of the phenomenon, including photos of how it is performed
Cloud Seeding; Its Prospects and Concerns in the Modern World-A Review
These are two articles that are very distant in year of publication, thus highlighting that the phenomenon was already known more than 20 years ago
It is important to distinguish them from classic condensation trails, because if all trails were like that, we would be intoxicated by now.
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