Subject: Severe (G4) geomagnetic storm watch for 5/10-11

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SMS Alert Text:


NOAA: Severe (G4) Geomagnetic Storm Watch from 5/10 thru weekend. Possible impacts on communications, power grids, navigation, radio & satellite ops. See email.



Supplemental Info:


NOAA’s Space Weather Prediction Center (SWPC) is monitoring the sun following a series of solar flares and coronal mass ejections (CMEs) that began on May 8. Space weather forecasters have issued a Severe (G4) Geomagnetic Storm Watch for the evening of Friday, May 10. Additional solar eruptions could cause geomagnetic storm conditions to persist through the weekend.



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


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


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



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