G2 – Moderate geomagnetic storm watch in effect
A G1 – Minor geomagnetic storm watch is in effect for September 1 and a G2 – Moderate for September 2, 2021.
The geomagnetic field is expected to be at quiet to unsettled conditions on August 31 due to the delayed anticipated passage of the August 26th coronal mass ejection (CME).1
G1 – Minor geomagnetic storm levels are likely on September 1 due to the anticipated arrival of the August 28th CME.2
G2 – Moderate storm levels are forecast for September 2 due to the anticipated arrival of the August 28 CME combined with a CME from a filament that disappeared from near center meridian at around 18:00 UTC on August 28.
Space Weather Message Code: WATA30
Serial Number: 189
Issue Time: 2021 Aug 30 2039 UTC
WATCH: Geomagnetic Storm Category G2 Predicted
Highest Storm Level Predicted by Day:
Aug 31: None (Below G1) Sep 01: G1 (Minor) Sep 02: G2 (Moderate)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents – Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft – Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio – HF (high frequency) radio propagation can fade at higher latitudes.
Aurora – Aurora may be seen as low as New York to Wisconsin to Washington state.
References:
1 Forecast Discussion – Issued: 2021 Aug 31 0030 UTC – Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center
2 Moderately strong M4.7 solar flare erupts from geoeffective AR 2860 – The Watchers
Featured image credit: NASA SDO/AIA 304. Acquired at 06:19 UTC on August 28, 2021
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