sunspot

The big sunspot tossed out a CME and the arrival expected late Wednesday (Sept. 6), with G-2 and G-3 storms Wednesday and Thursday. After the CME arrives, auroras will likely appear over places such as Alaska, Scandinavia, Iceland, and Greenland, and perhaps even northern-tier US states from...

Barely visible only 24 hours ago, a new sunspot group big enough to swallow Earth is bubbling up through the solar surface. So far the active region poses no threat for strong solar flares, but this could change if its rapid growth continues. Visit today's edition of Spaceweather.com to view a...