General Knowledge - World Geography - Discussion

39. 

The initial increase of magnetic field in magnetic storms is caused

[A]. when the shock wave, associated with the gusty solar wind, compresses the magnetosphere
[B]. when there is a large decrease in field intensity
[C]. when the gust wind itself engulfs the magnetosphere
[D]. None of the above

Answer: Option A

Explanation:

No answer description available for this question.

Riya said: (Mar 29, 2013)  
A geomagnetic storm is a temporary disturbance of the Earth's magnetosphere caused by a solar wind shock wave and/or cloud of magnetic field which interacts with the Earth's magnetic field. The increase in the solar wind pressure initially compresses the magnetosphere and the solar wind's magnetic field interacts with the Earth's magnetic field and transfers an increased energy into the magnetosphere. Both interactions cause an increase in movement of plasma through the magnetosphere (driven by increased electric fields inside the magnetosphere) and an increase in electric current in the magnetosphere and ionosphere.

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