Flare and Proton Event (July 27, 2012)
Magnetic active region 1520-1521 erupted again (July 19, 2012) at the edge of the Sun, this time producing an M7-class flare that almost crossed the threshold into X-territory (largest). Associated with the flare was a coronal mass ejection observed by SOHO's two coronagraphs. The small, white particles splattering the CCD for hours after the eruption are high-energy protons moving at half the speed of light. The front edge of the mass ejection was clocked at over 2 million miles an hour.
SOHO began its Weekly Pick some time after sending a weekly image or video clip to the American Museum of Natural History (Rose Center) in New York City. There, the SOHO Weekly Pick is displayed with some annotations on a large plasma display.
If your institution would also like to receive the same Weekly Pick from us for display (usually in Photoshop or QuickTime format), please send your inquiry to firstname.lastname@example.org.