NOAA is listing storm probabilities for Sept. 6th as high as 90%. This means auroras are almost certain over parts of Alaska, Canada, Scandinavia, Iceland, and Greenland. People in northern-tier US states from Maine to Washington might see auroras, too, if they are bright enough to pierce the glare of the full Moon.
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UPDATE: MAJOR X-CLASS SOLAR FLARE: On Sept. 6th at 1202 UT, sunspot AR2673 unleashed a major X9.3-class solar flare--the strongest solar flare in more than a decade. X-rays and UV radiation from the blast ionized the top of Earth's atmosphere, causing a strong shortwave radio blackout over Europe, Africa and the Atlantic Ocean
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The explosion also produced a CME, shown here in a movie from NASA's STEREO-A spacecraft. (The fast moving star-like object in the STEREO-A movie is the planet Mercury.) NOAA analysts are still modeling the trajectory of the CME to determine whether or not it is Earth-directed.
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WAITING FOR GEOMAGNETIC STORMS: A CME struck Earth's magnetic field during the late hours of Sept. 6th. So far the impact has done little to stoke strong geomagnetic activity. Another CME is on the way, however, and it is more potent, having been accelerated in our direction by yesterday's powerful X9-class solar flare. NOAA forecasters say strong G3-class geomagnetic storms are possible on Sept. 8th when the inbound CME arrives
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