Behemoth sunspot 1302 unleashed another strong flare on Saturday morning--an X1.9-category blast at 0940 UT. NASA's Solar Dynamics Observatory recorded the extreme ultraviolet flash:


The movie also shows a shadowy shock wave racing away from the blast site. This is a sign that the blast produced a coronal mass ejection (CME). The CME isn't heading directly toward Earth, but it might deliver a glancing blow to our planet's magnetic field 2 to 3 days hence. Stay tuned for further analysis.

UPDATE: Sunspot 1302 followed today's X2-flare with an M7-flare nearly as strong (movie). So far none of the blasts has been Earth-directed, but this could change as the sunspot turns toward our planet in the days ahead. The sunspot is growing and shows no immediate signs of quieting down.