Visibility V / V
The northern lights were left behind the clouds this time, but their green light illuminated so much that they are clearly visible in a keogram composed of images from the Nyrölä Observatory's automatic AllSky camera (time 00-00 UT as a horizontal axis, south-north as a vertical axis). In the second picture, all the pictures taken during the day.
http://nyrola.jklsirius.fi/ccd/capture/allsky/
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Me tuolla porukalla illalla katseltiin (ja naureskeltiin) tuota nyrölän kuvaa kun se oli aivan täysin vihreä :)
Hieno tapa raportoida "huono" ilta!
Samaa mieltä, todella kekseliäs, hieno havainto.