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Post by Sowelu on Feb 2, 2011 2:45:15 GMT -5
GEOMAGNETIC STORM WATCH: NOAA forecasters estimate a 60% chance of polar geomagnetic storms on Feb. 3rd. They say a high-speed solar wind stream and a CME could hit Earth's magnetic field on Wednesday—a double whammy almost certain to spark some degree of geomagnetic activity. High-latitude sky watchers should be alert for auroras.
Found here
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A geomagnetic storm is a temporary disturbance of the Earth's magnetosphere caused by a disturbance in space weather. Associated with solar flares and resultant solar coronal mass ejections (CME), a geomagnetic storm is caused by a solar wind shock wave and/or cloud of magnetic field which typically strikes the Earth's magnetic field 3 days after the event. The solar wind pressure on the magnetosphere and the solar wind magnetic field will increase or decrease depending on the Sun's activity. The solar wind pressure changes modify the electric currents in the ionosphere, and the solar wind's magnetic field interacts with the Earth's magnetic field causing the entire structure to evolve. Magnetic storms usually last 24 to 48 hours, but some may last for many days.[citation needed] In 1989, an electromagnetic storm disrupted power throughout most of Quebec[1] and caused aurorae as far south as Texas.[2]
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References
[1] ^ a b Scientists probe northern lights from all angles, CBC, October 22, 2005 (English)
[2] ^ a b Earth dodges magnetic storm, New Scientist, 24 June 1989 (English)
— Wikipedia
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Post by Sowelu on Feb 4, 2011 23:30:06 GMT -5
GEOMAGNETIC STORM: A solar wind stream hit Earth's magnetic field during the late hours of Feb. 4th, sparking a G2-class (Kp=6) geomagnetic storm, in progress. High-latitude sky watchers should be alert for auroras, especially during the hours around local midnight.
www.spaceweather.com/
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