Quote:
Originally Posted by deanm
What I don't understand is how no-one noticed these things until now: they're hardly inconspicuous, going by the pictures...
Dean
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They've been noticed before by enthusiasts, just taken a while for the experts to cotton on. In fact, Ian Cooper, an IISer, has a nice pano of a redder version from 2001. Here are some more articles and footage over the years -
http://news.spaceweather.com/protonarc/
https://www.youtube.com/watch?v=RC4TFQUA3dk
https://www.youtube.com/watch?v=KxyImmQhujE
https://www.youtube.com/watch?v=p5J7L5-bc1M
funny that people were calling it a 'proton arc', but that term is used in the literature for a very different type of aurora, barely detectable at visible wavelengths.