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On 2012 March 7 two bright X-class flares originating from the active region NOAA AR 11429 erupted within an hour of each other, marking one of the most active days of Solar Cycle 24. The Fermi Large Area Telescope (LAT) observed both the impulsive and the long duration phases of these two bright flares detecting gamma-rays up to 4 GeV and > 100 MeV emission for ∼ 20 hours. Thanks to the increased sensitivity of the LAT we were able to accurately localize the high-energy gamma-ray emission to the same active region from which the X-ray emissions associated with these flares originated. Here we present the Fermi LAT detections of these bright solar flares and the implications for the emission processes tied to these explosive phenomena.

Fermi Large Area Telescope observations of high-energy gamma-ray emission from the X-class solar flares of 2012 March 7