A colossal butterfly-shaped coronal hole has opened in the sun’s atmosphere and is currently spewing a fast-moving stream of solar wind toward Earth that could trigger a moderate geomagnetic storm and dazzling auroras this weekend. The high-speed solar wind from this striking feature, spanning some 310,000 miles (500,000 kilometers) across, is expected to reach Earth around Sept. 14. Space weather …
Read More »Aurora alert! Butterfly-shaped ‘hole’ in sun’s atmosphere could spark geomagnetic storm Sept. 13-14
