Severe geomagnetic storm subsiding

Severe geomagnetic storm subsiding

A severe geomagnetic storm (Kp=7 to 8) that began yesterday when a CME hit Earth's magnetic field is subsiding.

At the peak of the disturbance, auroras were sighted around both poles and in more than six US states including MichiganNew YorkSouth DakotaMaineMassachusetts and Minnesota. Sky watchers at the highest latitudes should remain alert for auroras as Earth's magnetic field continues to reverberate from the CME impact.

Solar wind
speed: 539.7 km/sec
density: 0.1 protons/cm3

The Radio Sun
10.7 cm flux: 148 sfu

Planetary K-index
Now: Kp= 2 quiet
24-hr max: Kp= 7 strong

Interplanetary Mag. Field
Btotal7.9 nT
Bz3.6 nT north 

The source of all this solar and geomagnetic activity is sunspot AR1302. Measuring more than 150,000 km from end to end, the sprawling active region is visible even without a solar telescope. 


The sunspot has quieted down since unleashing dual X-flares on September 22nd and 24th. Nevertheless, NOAA forecasters estimate a 40% chance of more X-flares during the next 24 hours. Any such eruptions would be Earth-directed as the sunspot crosses the center of the solar disk. (SpaceWeather)

Featured image credit: SpaceWeather


Queyras 9 years ago

The northern lights were seen last night as far south as Michigan, New York, South Dakota and Maine in the United States, and also from Europe and New Zealand. It was the strongest geomagnetic storm since October 2003. A HD video of what the northern lights look like during a strong geomagnetic storm as we had yesterday can be seen at

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