As predicted by analysts at the Goddard Space Weather Lab, a coronal mass ejection (CME) hit Earth’s magnetic field at ~03:30 UT on Sept 17th. The impact sparked a moderate geomagnetic storm (in progress) and auroras around the Arctic Circle. High-latitude sky watchers should remain alert for auroras tonight as Earth’s magnettic field continues to reverberate from the CME’s impact. (SpaceWeather)
Solar wind
speed: 433.4 km/sec
density: 2.4 protons/cm3The Radio Sun
10.7 cm flux: 143 sfuPlanetary K-index
Now: Kp= 6 storm
24-hr max: Kp= 6 stormInterplanetary Mag. Field
Btotal: 13.5 nT
Bz: 0.6 nT north
The solar wind measured by the ACE Spacecraft increased from 400 km/s to near 550 km/s and this indicates a small CME impact. Minor geomagnetic storming reaching the G1 level is now taking place with the help of a southward Bz.
http://philosophers-stone.co.uk/wordpress/2011/09/geomagnetic-storm-in-progress/
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