The sun's returning coronal hole could stir up geomagnetic storms and dazzling auroras under clear, dark skies this weekend.
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Aurora alert! Butterfly-shaped 'hole' in sun's atmosphere could spark geomagnetic storm Sept. 13-14
A colossal butterfly-shaped coronal hole has opened in the sun's atmosphere and is currently spewing a fast-moving stream of solar wind toward Earth that could trigger a moderate geomagnetic storm and ...
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