It has been a very quiet week on the Sun. After the large filament rotated off the western horizon, flux activity decreased to low. There were only a few small c-class flares.
Late yesterday and today, however we’ve seen a little activity. The CH HSS from a mid-latitude coronal hole arrived late the Feb 15 period. It brought negative Bz, and Bt above 10. Together, those pushed the KP values up to 4.
Aurora were reported in Northern Europe, and the North East US. As of 11:00pm Eastern time the Ovation Oval was showing high chances for Aurora at upper latitudes. At the same time, skies were clear in the Much of the northeast and Northwest united states. Here’s an image @northlightalert (follow!) posted to Twitter:
For today’s featured tweet, Northern lights were observed at Mount Washington Observatory:
— MWObs (@MWObservatory) February 17, 2015