SOME RED AURORAS ARE *NOT* AURORAS: The biggest geomagnetic storm in years erupted this month, Nov. 4th, after a CME slammed into Earth’s magnetic field. Red auroras spread as far south as California and New Mexico. Upon closer inspection, however, not all of the lights were auroras. Full story @ Spaceweather.com.

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Above: Not an aurora. This red arc is something else, an “SAR.” Photo credit: Matti Helin of Finland.