G1 Geomagnetic Storm
Taken by Stuart Green on March 14, 2021 @
Preston, Lancashire, UK
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Details:
The Spaceweather.com predicted G1 geomagnetic storm arrived in the late hours of March 13th UTC and had a significant impact on magnetometers such as my own here in the UK. The cause was an uptick in the solar wind speed to over 550 km/s coupled with an oscillating positive/negative interplanetary magnetic field (Bz). The storm was preceded by geomagnetic unrest, also resulting from negative Bz, but with significantly slower wind speeds of around 350 km/s.
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