The spring equinox is today, March 20, at 2245 UTC.
On Tuesday, March 17 a CME struck Earth producing the largest geomagnetic storm of the current solar cycle. Aurora was visible all the way down to the central United States. The planetary A index for the day was 117, an incredibly high number. It looks like the greatest impact was in the second half of the UTC day, when the planetary K index in...
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On Tuesday, March 17 a CME struck Earth producing the largest geomagnetic storm of the current solar cycle. Aurora was visible all the way down to the central United States. The planetary A index for the day was 117, an incredibly high number. It looks like the greatest impact was in the second half of the UTC day, when the planetary K index in...
Continue reading...