A series of coronal mass ejections (CMEs) produced by Regions 2887 and 2891 over the past couple of days will likely impact Earth by late November 3 to early November 4, causing additional enhancements to the solar wind environment already enhanced due to coronal hole influence. CME effects are expected to persist through November 5.
As a result, SWPC has issued a G2 – Moderate geomagnetic storm watch for November 4.
(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.
Quiet to unsettled geomagnetic field levels are expected for most of November 3 ahead of the November 2 CMEs.1, 2
G1 – Minor geomagnetic storm conditions are likely, with a chance for G2 – Moderate storm levels, late on November 3 to early on November 4 due to combined CME/CH HSS activity.2
Unsettled to active levels are expected on 05 Nov as CH HSS and CME effects wane.
- A geomagnetic sudden impulse was detected at 19:57 UTC, signaling the arrival of CME to Earth.
Space Weather Message Code: SUMSUD Serial Number: 232 Issue Time: 2021 Nov 03 1957 UTC SUMMARY: Geomagnetic Sudden Impulse Observed: 2021 Nov 03 1957 UTC Deviation: 21 nT Station: FRD NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-
- Series of CMEs impact Earth, sparking G3 – Strong geomagnetic storming – The Watchers
1 Long-duration M1.7 solar flare erupts from geoeffective AR 2981, CME impact expected – The Watchers
2 Forecast Discussion Issued: 2021 Nov 03 1230 UTC – Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center
Featured image credit: ESA/NASA, Helioviewer, TW
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