Saturday, August 20, 2011

Double Coronal Holes

A double-barreled hole has opened up in the sun's atmosphere and it is spewing a split-stream of solar wind toward Earth. NASA's Solar Dynamics Observatory captured this composite UV image of the double coronal hole on August 20th.

Sky watchers should be alert for auroras when the solar wind arrives on August 22-24. NOAA forecasters estimate a 35% to 50% chance of high-latitude geomagnetic activity. -- Space Weather

Related: The Sun-Earth Connection

Enhanced Technique for Tracking Solar Storms All the Way From Sun to Earth