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Issued on 2020 Nov 21 2339 UTC
The in situ observations show the arrival of a shock wave registered in all solar
wind parameters at 17:00UT on Nov 21st. The magnetic field magnitude decreased from
11 to 9 nT with the Bz component dropping from 7 nT to -9 nT. The solar wind speed
increased from 383 to 445 km/s. Related to the shock arrival the geomagnetic
conditions remained globally unsettled and reached locally active conditions in
Dourbes. The source for the observed shock is the arrival of a high-speed stream
related to the positive polarity coronal hole CH 96, which first crossed the central
meridian on Nov 19th. Currently the solar wind speed has increased to 535 km/s,
increasing the probability for minor geomagnetic storms.
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