The space weather alert was triggered by an M8-class solar flare from sunspot 4299 on December 6, which immediately preceded the incoming CME.
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NASA and NOAA issue geomagnetic storm warning for Dec. 9
This follows a strong solar flare produced on Dec. 6, which came from sunspot 4299 and was an M8-class event, nearly the top rating.
Kerry Breen is a news editor at CBSNews.com. A graduate of New York University's Arthur L. Carter School of Journalism, she previously worked at NBC News' TODAY Digital. She covers current events, ...
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