Multiple coronal mass ejections (CMEs) produced on November 27 and 28, 2023 are heading toward Earth, with impacts expected from late November 30 to mid-day UTC on December 1, 2023. As a result, a G3 – Strong Geomagnetic Storm Watch is in effect for December 1.
Multiple CMEs produced on November 27 were modeled and determined to have at least somewhat of an Earth-directed components. Then, at 19:50 UTC on November 28, a very strong solar flare measuring M9.8 erupted from Active Region 3500, and at approximately 20:12 UTC a full halo CME appeared in LASCO C2 coronagraph imagery.
Analysis and modeling of this event determined an arrival time of early to midday on December 1.
With 3 CMEs already inbound, the addition of a 4th, full halo CME has prompted SWPC forecasters to upgrade the G2 – Moderate Geomagnetic Storm Watch on December 1 to a G3 – Strong watch.
This faster-moving halo CME is progged to merge with 2 of the 3 upstream CMEs, all arriving at Earth on December 1. G3 – Strong conditions are now likely on December 1.
Featured image credit: NASA/ESA LASCO C3, Helioviewer, The Watchers
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