Two CMEs to impact Earth, G3 – Strong Geomagnetic Storm Watch in effect for December 31
At least two coronal mass ejections (CMEs) are heading toward Earth, with impacts expected on December 31 and January 1, 2025. The first CME — much stronger, was produced by a filament eruption associated with an M2.0 flare at 04:30 UTC on December 29 from Active Region (AR) 3939. This resulted in an asymmetric, partial-halo CME first seen in NASA coronagraph imagery at approximately 06:24 UTC.










