Space Weather Alert: Geomagnetic K-index of 8 (G4)

Status Report From: Space Weather Prediction Center (NOAA)
Posted: Tuesday, March 17, 2015

Space Weather Message Code: ALTK08

Serial Number: 18

Issue Time: 2015 Mar 17 1401 UTC


ALERT: Geomagnetic K-index of 8

Threshold Reached: 2015 Mar 17 1358 UTC

Synoptic Period: 1200-1500 UTC


Active Warning: Yes

NOAA Scale: G4 - Severe


NOAA Space Weather Scale descriptions can be found at


Potential Impacts: Area of impact primarily poleward of 45 degrees Geomagnetic Latitude.

Induced Currents - Possible widespread voltage control problems and some protective systems may mistakenly trip out key assets from the power grid. Induced pipeline currents intensify.

Spacecraft - Systems may experience surface charging; increased drag on low earth orbit satellites, and tracking and orientation problems may occur.

Navigation - Satellite navigation (GPS) degraded or inoperable for hours.

Radio - HF (high frequency) radio propagation sporadic or blacked out.

Aurora - Aurora may be seen as low as Alabama and northern California.

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