An instrument aboard CALIPSO projects a visible green laser near its ground track in order to do atmospheric science. The laser pulses at about 20 Hz and under clear, dark skies makes spots on the ground visible to the naked eye. The spots are something like 90 meters in diameter and 370 meters apart. For much more information about CALIPSO the following NASA web site is good: http://www-calipso.larc.nasa.gov/ Also, coordinate predictions of the beam ground path are usually posted at: http://www-calipso.larc.nasa.gov/tools/overpass/coords/ I have personally seen CALIPSO's laser spots moving across the ground, Gregg Hendry -------------- next part -------------- An HTML attachment was scrubbed... URL: http://mailman.satobs.org/mailman/private/seesat-l/attachments/20120529/c66c9dba/attachment.html _______________________________________________ Seesat-l mailing list http://mailman.satobs.org/mailman/listinfo/seesat-l
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