All solar activity indicators rose this week: sunspot numbers, solar flux and geomagnetic indices.
On January 7 the interplanetary magnetic field tipped south, opening a crack to admit solar wind. This triggered the largest geomagnetic storm since September 2014. That same day the planetary A index jumped to 38, pushing the average for the week to 17.7. The previous seven days (the final seven d...
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On January 7 the interplanetary magnetic field tipped south, opening a crack to admit solar wind. This triggered the largest geomagnetic storm since September 2014. That same day the planetary A index jumped to 38, pushing the average for the week to 17.7. The previous seven days (the final seven d...
Continue reading...
