Auroras over Prairie Lake.

A Mild
Substorm

September 16, 2026 Grand Rapids, MN Kp 4-
© 2026 Bob Conzemius / TornadoBob.com
Aurora account

The Night

Maybe there were some residual CME effects going on. Whatever the case, Bz was slightly south again. It maybe hit -5 nT during the day and was near 0 in the evening. I decided to go out and take a look. The shortest trip to nice, dark skies was Prairie Lake, and that's where I went. I did not stay long because the show was not going to come up from the horizon. When I started shooting, there was a little bit of structure, which was nice to see. Knowing that this would likely be the best I would see, I went home pretty quickly after that.

Mild structure
A little bit of structure shows up.
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