Aurora – Helsinki, 2005 September 10/11
Sep 11 2005
When sunspot 808 appeared on the east limb of the sun, it quickly became clear that it has the potential to trigger major aurora displays during the middle of September. Until September 12, a series of X and M class flares had blown their energy into space – serving earth with magnetic storms.
The faint green arc has been visible for almost the whole night, due to constantly high activity.
Image caption: Helsinki-Viikki (stitched from four images). 2005-09-11, 0030 EEST N 60°21.76 E 25°02.41
Only about an hour after the sky had become completely dark, the first substorm triggered northern lights that were to be observed even from illuminated places.
Image caption: Helsinki-Viikki 2005-09-10, 2224 EEST N 60°23.33 E 25°03.07
During the second of two substorms that night, the aurora became pretty lively and was moving at times very fast.
Image caption: Helsinki-Viikki (stitched from two images, cropped). 2005-09-11, 0005 EEST N 60°23.08 E 25°03.58
See, how the show continued just about 48 hours later.
