The solar flare occurred at about 11 p.m. EST Sunday and will hit Earth with three different effects at three different times. The biggest issue is radiation, according to the National Oceanic and Atmospheric Administration's Space Weather Prediction Center in Colorado.
The radiation is mostly a concern for satellite disruptions and astronauts in space. It can cause communication problems for polar-traveling airplanes, said space weather center physicist Doug Biesecker.
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A massive sunspot released a M9-class solar flare (one step below the most powerful x-class flares) on January 23, 2012. The resulting coronal mass ejection may set off geomagnetic storms on Earth by January 24th or 25th.
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