CH HSS sparks geomagnetic storm reaching G1 levels

CH HSS sparks geomagnetic storm reaching G1 levels

Our planet is under the influence of a recurrent, positive polarity coronal hole high speed stream since around 20:48 UTC on February 23. This is causing G1 geomagnetic storming.

Geomagnetic K-index of 5 (G1 - Minor geomagnetic storm) threshold was first reached at 01:35 UTC.

Area of impact is primarily poleward of 60 degrees Geomagnetic Latitude. Under G1 conditions, weak power fluctuations can occur, minor impact on satellite operations is possible and aurora may be visible at high latitudes.

The geomagnetic field is expected to be at quiet to active levels on February 24 and 25 with G1 geomagnetic storming likely through the rest of the UTC day. Quiet to unsettled levels are expected on February 26.

Estimated planetary K-incex February 24, 2017Detected coronal holes February 24, 2017

Space Weather Message Code: ALTK05
Serial Number: 1062
Issue Time: 2017 Feb 24 0135 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2017 Feb 24 0135 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

Featured image credit: NOAA/SWPC

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Tags: g1 storm


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