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Geomagnetic storming reaching G2-Moderate levels in progress

geomagnetic-storming-reaching-g2-moderate-levels-in-progress

Coronal Mass Ejection (CME) produced by a long duration M6.5 solar flare on June 22 appears to have arrived at 13:00 UTC on June 24.

Bt increased to 15nT and solar wind velocities increased to over 700 km/s at the time. Bz, however, remained largely positive and the overall strength of this event was disappointing versus forecast expectations, SWPC said.

The geomagnetic field activity decreased to unsettled and eventually quiet conditions, as a result of a weak Bt and little negative Bz, despite the CME arrival.

However, geomagnetic field further destabilized and G2-Moderate geomagnetic storm (K-index of 6) threshold was reached at 08:13 UTC on June 25. Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.

Under G2 geomagnetic storm conditions power grid fluctuations can occur, high-latitude power systems may experience voltage alarms. Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible. HF (high frequency) radio propagation can fade at higher latitudes.

Aurora may be seen as low as New York to Wisconsin to Washington state.

Space Weather Message Code: ALTK05
Serial Number: 794
Issue Time: 2015 Jun 25 0732 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2015 Jun 25 0730 UTC
Synoptic Period: 0600-0900 UTC

Active Warning: Yes
NOAA Scale: G1 – Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/NOAAscales

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.

Image credit: NOAA/SWPC.

Space Weather Message Code: ALTK06
Serial Number: 348
Issue Time: 2015 Jun 25 0824 UTC

​ALERT: Geomagnetic K-index of 6
Threshold Reached: 2015 Jun 25 0813 UTC
Synoptic Period: 0600-0900 UTC

Active Warning: Yes
NOAA Scale: G2 – Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/NOAAscales

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents – Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft – Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio – HF (high frequency) radio propagation can fade at higher latitudes.
Aurora – Aurora may be seen as low as New York to Wisconsin to Washington state.

Long duration M7.9 solar flare erupts from Region 2371, CME produced

Meanwhile, Region 2371 produced another strong solar flare reaching M7.9 at 08:16 UTC on June 25, 2015. Radio signatures suggest a CME was produced. Find detailed report about this event here.

Featured image credit: NOAA/SWPC.

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