Variation of Geomagnetic Storm as Observed During Solar Cycle 24.
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Date
2017-08
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Addis Ababa University
Abstract
The sun activity governs the interaction of magnetosphere with solar wind and Earth
magnetic eld, this in
uence of magnetosphere is called Geomagnetic storm. The
main point to study Geomagnetic storm is used to understand the current passing
through the ionosphere. The Geomagnetic Storms occurred during the whole solar
cycle 24 were analyzed using southward Interplanetary magnetic eld (IMF(Bz)),
Interplanetary electric eld of the ring current (IEF), the solar wind velocity (SW)
and the Dst index from OMNI data explorer. As the results reveal at the high
solar activity CME driven geomagnetic storms are more prominent than CIR driven
Geomagnetic Storms. On the Other hand, these solar activity starts declining solar
maximum events derived from CIR-driven storms. Moreover that it is clear from the
observations of geomagnetic storm events that the occurrence of Geomagnetic Storms
is highly correlated with the southward turning of Bz, the z component of IMF.
The magnitude of turning of Bz into southward direction from northward direction
depends highly upon the severity of the storm
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Keywords
Variation of Geomagnetic Storm