Comet C/2012 X1 LINEAR shortly after its outburst on 20 October 2013 when the comet suddenly brightened by over 5 magnitudes (the photo above was taken on 22 October 2013).
Comet C/2011 L4 Pan-STARRS and Northern Lights in Grøtfjord, Norway
Comet C/2011 L4 Pan-STARRS and Northern Lights