(via APOD: 2012 October 11 - Aurorae over Planet Earth)
Holy cow! Thanks to the coronal mass ejection (CME) on the 4th/5th, we got a decent bit of aurorae on the 7th/8th as the charged particles from the Sun impacted the Earth’s magnetosphere, exciting oxygen and nitrogen in the upper atmosphere.
Shown here is a shot of North America (centered, a bit, on Chicago!) with the city lights shining through.
Aurorae over Planet Earth
Image Credit : NASA, NOAA, GSFC, Suomi NPP, Earth Observatory,
processing by Jesse Allen and Robert Simmon