Calima affects transparency

Astrophotography from Ursa Major Observatory @ ROSA

Exposure data
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2017-07-23 + 24
Astro-Physics 175mm f/8 Starfire EDF with field flattener (f=1452mm)
10micron GM3000 HPS
comparison of two frames with 6 min exposure time
6 min
Moravian G4-16000 with Baader filters
This gif animation compares two luminance frames of LBN 7 with an exposure time of 6min, which were captured on two consecutive nights at the same altitude of 45°. Both nights were completely cloudless, but in the second night Calima (a hot, sand laden wind that blows in from the Northern Sahara) worsened the transparency. Image acquisition by CEDIC team (Bernhard Hubl, Christoph Kaltseis, Markus Blauensteiner, Michael Hanl) Image processing by Bernhard Hubl
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Moravian G4-16000 with Baader filters