Double Coronal Hole

DOUBLE CORONAL HOLE: 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