Severe (G4) geomagnetic forecast for 10-11 Oct

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Subject: Severe (G4) geomagnetic forecast for 10-11 Oct

SMS Alert Text:

NOAA issues a Severe (G4) Geomagnetic Storm Watch for 10-11 Oct.. Potential for impacts on communications, power grids, navigation, and satellite operations.

Supplemental Info:

Geomagnetic Storm

Level: G4 - Severe

Effects:

Power systems: Possible widespread voltage control problems and some protective systems will mistakenly trip out key assets from the grid.

Spacecraft operations: May experience surface charging and tracking problems, corrections may be needed for orientation problems.

Other systems: Induced pipeline currents affect preventive measures, HF radio propagation sporadic, satellite navigation degraded for hours, low-frequency radio navigation disrupted, and aurora has been seen as low as Alabama and northern California (typically 45° geomagnetic lat.).

More via the NOAA Space Weather Prediction Center:

"A fast coronal mass ejection (CME) erupted from the Sun the evening of 8 October, 2024, and is likely to arrive at Earth on 10 October. This CME has been analyzed and speed estimates are 1200 to 1300 km/s. This makes for a potential arrival time as early as the morning to midday of 10 October EDT. There is potential to reach G4 (Severe) upon arrival of this CME and throughout its passage. We won’t know the characteristics of the CME until it arrives 1 million miles from Earth and its speed and magnetic intensity are measured by the DSCOVR and ACE satellites. Please visit our webpage for the latest information and updates."

https://www.swpc.noaa.gov/

https://www.swpc.noaa.gov/noaa-scales-explanation

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Subject: Severe (G4) geomagnetic forecast for 10-11 Oct