An interplanetary shock wave possibly associated with an Oct. 6 coronal mass ejection (CME) blew by Earth this afternoon and sparked auroras at high latitudes. As of 6 p.m. CDT we’re in the middle of a minor G1 geomagnetic storm. Judging from the satellite images of the auroral oval, the “apron” of northern lights that spreads outward across the polar regions, skywatchers across much of Scandinavia are getting a good show.
UPDATE: The aurora is out right now (8 p.m. CDT) here in Duluth, Minn. I’ve also heard of another report of northern lights over Maine.
Observers in the northern U.S. and southern Canada should be on the lookout for possible auroras this evening. NOAA forecasters are calling for a 25 percent chance of minor storms at mid-latitudes. Here in northern Minnesota, we’re at 100 percent; aurora now fills half the northern sky. Nothing dramatic just yet – lots of faint rays and an occasional band or two.
Just a quick note on the photo at very top. It was taken by the STEREO Behind spacecraft and provides a perspective on the sun impossible with ground-based telescopes. STEREO-B trails far behind the Earth as it orbits the sun, keeping an eye on the solar backside. A second STEREO Ahead probe monitors the Earth-facing hemisphere for complete sun coverage.
Good luck tonight!