M9 Solar Flare (1-23-12)
This SDO image (AIA 193) shows an M9-class solar flare erupting on the Sun's northeastern hemisphere at 03:49 UT on Jan. 23, 2012... just 4 days after a previous strong CME that sparked aurora around the world on the 22nd. More geomagnetic activity is expected for the 24th.
NASA/SDO and the AIA consortium. Edited by J. Major.
More at sdo.gsfc.nasa.gov/
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Taken on January 23, 2012