Solar alert

Issued on 2021 Nov 03 2037 UTC

A shock was observed in Solar wind data as recorded by DSCOVR. At 19:24UT Solar wind speed jumped from 498km/s to 542 km/s and the interplanetary magnetic field jumped from 4nT to 9nT. Meanwhile Solar wind speed rose above 700 km/s and the interplanetary magnetic field peaked near 20nT and remains above 10nT. Bz was initially positive but is now firmly negative at -10nT. These signatures mark the early arrival of one of the expected CMEs. With current Solar wind velocity and negative values of Bz, if persistent, moderate geomagnetic storms can be expected.

Reference for this alert

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