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CME hits Earth, G3 Strong geomagnetic storming expected

cme-hits-earth-g3-strong-geomagnetic-storming-expected

The December 28th coronal mass ejection (CME) produced by the long duration M1.8 solar flare passed the ACE spacecraft at 00:02 UTC on December 31 and reached our planet at 00:51 UTC.

Geomagnetic K-index of 4 threshold was reached at 01:05 UTC. The impact is expected to drive geomagnetic storming to G3 Strong levels.

Additional enhancement in the magnetic field strength is expected on January 1 due to the arrival of an anticipated co-rotating interaction region (CIR) in advance of a positive polarity coronal hole high-speed stream (CH HSS). Persistent CH HSS influence is expected through January 2.

 

Space Weather Message Code: WATA50
Serial Number: 59
Issue Time: 2015 Dec 30 2136 UTC

WATCH: Geomagnetic Storm Category G3 Predicted

Highest Storm Level Predicted by Day:
Dec 31:  G3 (Strong)   Jan 01:  G1 (Minor)   Jan 02:  None (Below G1)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents – Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft – Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation – Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio – HF (high frequency) radio may be intermittent.
Aurora – Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

***

Space Weather Message Code: SUMSUD
Serial Number: 217
Issue Time: 2015 Dec 31 0103 UTC

SUMMARY: Geomagnetic Sudden Impulse
Observed: 2015 Dec 31 0051 UTC
Deviation: 25 nT
Station: Jeju

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

***

Space Weather Message Code: ALTK04
Serial Number: 1845
Issue Time: 2015 Dec 31 0105 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2015 Dec 31 0105 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents – Weak power grid fluctuations can occur.
Aurora – Aurora may be visible at high latitudes such as Canada and Alaska.

Featured image credit: Zoltan Kenwell (InFocusImagery)

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