May 18, 2024 Auroras
Grand Rapids, MN
We had a CME impact with a persistently southward Bz, and although the strongest part of the geomagnetic storm (a G2 storm) was during the day, Bz stayed mildly south and brought a round of auroras just after midnight.
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| A thunderstorm dissipates over the eastern horizon before auroras start to the northeast. |
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| The auroras appear just after midnight. |
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| After the initial burst, more green auroras expand over the sky. |
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| The farthest south green blobs were about to the North Star. Kp index was 3.3 during this substorm. |
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| The solar wind during this event. |