This was a very active week for solar flares and aurora. On Monday and Tuesday the planetary A index was 55 and 76, indicating a geomagnetic storm. The planetary A index was high again on Thursday, June 25 at 33, and the high latitude college A index was 42.
It turns out that the magnetometer at Fredericksburg, Virginia was knocked out on five of the seven days, so the mid-latitude A index we ar...
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It turns out that the magnetometer at Fredericksburg, Virginia was knocked out on five of the seven days, so the mid-latitude A index we ar...
Continue reading...