Geomagnetic activity
Taken by Stuart Green on April 21, 2018 @
Preston, Lancashire, UK
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Details:
The interplanetary shock wave that struck the Earth last week, creating spectacular aurora, was particularly geoeffective because the magnetic field carried along with it had a strong southerly component. My magnetometer data captured over a three day period clearly show the arrival of the shock front just after midnight (UT) April 19th-20th. This coincided with the interplanetary solar wind magnetic component turning south, as indicated by the time coordinated solar wind data (red line) from the NOAA DSCOVR satellite.
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