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CME Impact! / Storm in Progress

September 1, 2025 @ 20:35 UTC (UPDATED)

The Boulder magnetometer located in Colorado, USA a geomagnetic sudden impulse around 21:00 UTC (Sept 1). This marks the exact moment the anticipated CME swept past Earth. A moderate (G2) geomagnetic storm is currently in progress and a watch for strong (G3) conditions as forecast will be in effect. Fluctuations in the solar wind data should be expected over the next several hours. Aurora sky watchers at middle to high latitudes should be alert once it is dark outside. ALERT: Geomagnetic K-index of 6 Threshold Reached: 2025 Sep 01 2236 UTC Synoptic Period: 2100-2400 UTC Active Warning: Yes NOAA Scale: G2 - Moderate SUMMARY: Geomagnetic Sudden Impulse Observed: 2025 Sep 01 2101 UTC Deviation: 58 nT Station: CNB

4208	B	N18W80	Stable
4207	B	N30E52	Growing
4206	A	N09E30	Stable
4205	A	N18E26	Stable
4202	A	S14W19	Stable
4201	A	S22W23	Declining
4199	B	N04W22	Stable
4197	BG	S18W38	Declining
4191	B	N11W82	Declining