"Oscar A. Rodriguez / PMEE-SPACE" wrote: > I received a photo via e-mail yesterday. It depics what it appears to be > an airplane trail in the sky. The photo was taken in Cadiz (W6º19' - > N36º31') on December 9, at 18:00 CET approximately. The observation > lasted around 30 minutes (too long for being an aircraft trail, I > think). You can see the photo through this link: > http://www.arrakis.es/~obaquero/temp/Photo_01.jpg Oscar, To me the white track in the photograph resembles many airplane trails I have seen when nearing the area in the sky with the same azimuth as the sun. Depending which part of the aircraft is reflecting the sunlight it might be a bit before or after the exact sun's azimuth has been attained. I often use this phenomenon to explain the "Iridium flares" when a relatively speaking large surface is reflecting sunlight in one's direction. I have my doubts about those 30 minutes observation time. Everything would be highly overexposed or the clouds in the background would be not as clear as in the photograph. My judgement is simply based on own experiences. I might be completely wrong. Thanks for the Christmas wishes. May it be a joyful time to you and your beloved ones. Bram Dorreman COSPAR 4160 51° 16' 45.5" N 5° 28' 36.6" E (WGS84) 35 m ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
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