SOLAR FLARE: On Sept. 7th at 1740 UT (1:40 p.m. EDT), Earth-orbiting satellites detected a major X17-class solar flare coming from the sun's eastern limb: image. The blast caused a complete blackout of HF radio transmissions on the daylit side of Earth. Emergency personnel in hurricane-hit areas of the U.S. Gulf Coast may have experienced problems with their communications gear for minutes to hours after the flare.
The source of the flare was returning sunspot 798 (pictured right), which sparked strong auroras in late August. Two weeks of quiet followed those storms while the sunspot transited the farside of the sun--but now it's back, and it's turning toward our planet again.
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