http://astronomynow.com/2015/08/13/motind-by-runeengebo/

“Motind” by Rune Engebo

Motind is a hill in Troms. Living in Norway, the photographer has seen his fair share of aurorae, but on 21 January 2015 he witnessed the strongest variety of colours he had ever set eyes on in this beautiful explosion of purples and greens. Careening over the peaks of Senja, oxygen produces the greens and nitrogen the purples, seen in this particular display of the Northern Lights. Image credit: © Rune Engebo / Royal Museums Greenwich.

2015 competition now closed, here is a shortlist

https://www.flickr.com/photos/nationalmaritimemuseum/sets/72157655152478919

The 2015 competition is now closed for entries – thank you to all the entrants for participating. Shortlisted entrants will be notified via email during the week commencing 4 May 2015 and the winners will be announced on 17 September.

http://www.rmg.co.uk/whats-on/exhibitions/astronomy-photographer-of-the-year/competition/categories-prizes

http://www.rmg.co.uk/whats-on/exhibitions/astronomy-photographer-of-the-year/competition/categories-prizes

I like the solar flare by Gary Palmer. I didn’t know amateur astronomers could use narrowband spectral imaging to capture images like that. At a guess I’d say it was photographed in the calcium K line at 393.3 nm.