The aurora are looking back at us

Churning aurora over Kluane Lake, Yukon, September 2019 by the author
A keogram of a single night’s aurora activity from sunset on the left through sunrise on the right
All sky camera image of the aurora. The center slice of pixels north to south is sampled periodically
Taking the center column of pixels from an all-sky-camera image of the night sky and placing it in time sequence in a keogram. The keogram is like the spines of books on a bookshelf — a quick overview
Keograms allow quick recognition of different features of an evening’s sjy
Identifying the night’s activity from keograms
A stack of keograms from several nights in a row. You can see the moon, clouds, and green of the aurora and quickly note which nights are worth further archival research (try it here: https://www.jufaintermedia.com/demos/keogramindex/)

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