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Spaceweather.

MARCH IS THE BEST MONTH OF THE YEAR FOR AURORAS: Did you know that March is the best month of the year for auroras? It's true. A 75 year study shows that March has more geomagnetically active days than any other month of the year. (October is a close second.) This is due to the Russell-McPherron effect. In short, cracks tend to form in Earth's magnetosphere during weeks around equinoxes, allowing solar wind to spark Northern Lights.