Sun activity for September 13, 2023: Unexpected geomagnetic storm last night. Aurora alert!

Posted by C. Alex Young and Raúl Cortés and Armando Caussade, September 13, 2023

An unexpected coronal mass ejection (CME) hit Earth’s magnetic field last night and caused a G1 (minor) geomagnetic storm, which then intensified to a G2 (moderate) storm. The CME was likely fired into space after a filament eruption on September 8–9, and eventually collided with Earth on September 12 to trigger the G2 (Kp=6) storm threshold at 17:59 UTC.

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