CORONAL HOLE: A yawning dark hole in the sun's atmosphere is spewing solar wind toward Earth. NASA's Solar Dynamics Observatory photographed the opening during the early hours of Aug. 26th:
Solar wind flowing from this coronal hole is expected to arrive on Aug. 28-29, possibly causing geomagnetic activity around the poles. Arctic sky watchers should be alert for auroras on those dates. As summer winds down, the midnight sun is waning for improved visibility of Northern Lights.
