SATURDAY X-FLARE: 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). Analysts at the Goddard Space Weather Lab say the CME could deliver a glancing blow to Earth’s magnetic field on Sept. 26 at 14:10 UT (+/- 7 hours);

fr.spaceweather.com