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SOLAR FLARE AND RADIO BLACKOUT: Today, Sept. 28th at 1458 UT, a strong M7-class solar flare erupted in the magnetic canopy of sunspot AR2422. Extreme UV radiation from the flare ionized the top of Earth’s atmosphere and caused a brief low-frequency radio blackout over South America and the Atlantic ocean.
Blackout map http://spaceweather.com/images2015/28…
The flare itself was rather impulsive and a noteworthy coronal mass ejection (CME) does not appear evident.
AR2422 has an unstable ‘beta-gamma-delta’ magnetic field that could erupt again at any moment. NOAA forecasters estimate a 40% chance of additional M-class solar flares and a 5% chance of X-flares during the next 24 hours.
http://spaceweather.com/
http://www.solarham.net/
These images were taken by the SDO solar spacecraft.
http://sdo.gsfc.nasa.gov/