Nov. 22, 2021: The biggest geomagnetic storm in years erupted this month when a Cannibal CME slammed into Earth's magnetic field. Auroras spread as far south as California and New Mexico. Upon closer inspection, however, not all of those lights were auroras. Some were "SARs."
SARs are pure red arcs of light that ripple across the sky during strong geomagnetic storms.
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