AR 2158 produced an X class flare with associated CME which impacted Earth on 12/13th September 2014.
This is an image of the Aurora that impact induced, taken at 2245hrs GMT. Just a shade to W of North with the Plough in centre frame. It was quite a hazy night and over about 3 hours, there was little to see visually but long exposures picked up a green glow.
Canon 5D mark II with 24mm f 1.4L lens. 10 second exposure at f 2.8 and ISO 800. The image was taken at Portstewart Point, N.Ireland (55.2N, -6.72W).
Displayed on BBC Northern Ireland website: http://www.bbc.co.uk/news/uk-northern-ireland-29190109