North-south asymmetry in response of geomagnetic activity to different solar events |
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| Authors: | G K Rangarajan |
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| Institution: | (1) Indian Institute of Geomagnetism, 400005 Colaba, Bombay, India |
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| Abstract: | Study of the response of geomagnetic activity to five different kinds of solar events reveals that an average north-south
asymmetry of about 15% exists which diminishes with enhanced geomagnetic activity. The response of the geomagnetic field is
quite significant only when high speed solar wind stream in association with sector boundary of interplanetary magnetic field
(IMF) or solar proton streams near sector boundary sweeps past the earth. When the frequency of occurrence of indices of geomagnetic
activity is considered, the index zero shows a marked difference in its response characteristics for the southern hemisphere.
This appears to be a real feature and not attributable to any artefact of the index or its derivation. |
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| Keywords: | Asymmetry geomagnetic activity solar wind streams solar proton events sector boundary |
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