Throwback to Nov 12 2025 by Watermark Photography

It’s very rare that we have aurora alerts at the G4 storm level and rarer still that they disappoint so northern lights aficionados were pretty excited about the kP8/G4 Aurora Alert was issued for last night. While hopes were high & some good shots were taken, the actual output was surprisingly muted & short-lived. Our friends at EarthSky explain that this was due to the arrangement of the CME’s magnetic field limiting how much energy actually reached Earth’s atmosphere & shaping which regions saw auroras and which did not.

During the CME’s initial impact phase, the Bz briefly dipped strongly southward. So that allowed solar wind energy to flow efficiently into Earth’s magnetic field. This short-lived interaction quickly caused G4 (severe) geomagnetic storm levels, with Kp (another measure of Earth’s magnetic disturbance) exceeding 8.

Soon after the initial impact, the character of the severe geomagnetic storm changed dramatically. As Earth moved deeper into the core of the CME, the Bz – again, the orientation of the sun’s magnetic field – turned strongly northward. This sustained northward orientation sharply limited the transfer of transfer into Earth’s magnetosphere. And that was what restricted the auroras, despite the overall strength of the storm.

Jeff took this photo from Elberta Pier back in November of 2025 on a night the lights definitely did not disappoint! Follow Watermark Photography on Facebook and see more great shots in the A Little Night Music gallery on his website.