TEXT HERE DOES NOT MATCH WITH PICTURES. NEW TEXT IS UNDER CONSTRUCTION. (This old version is temporarily preserved for own use to help in writing new captions.)
THESE ARE (VERY) OLD SLIDE SCANS. SLIDES WILL BE RE-SCANNED, IMAGES ENLARGED AND NEW SLIDES SCANNED IN FUTURE.
Just "fancy" forms of contrails. However, planes and contrails are quite a nuisance in cloud photography and in astrophotography: occasionally there is no point to photograph an interesting cloud, because sky is spoiled by contrails. Likewise, putting effort on deepsky photography may turn out to be useless because f. ex. on my astrophotography site there is an hour long period with 4-7 planes passing overhead.
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