Solar and interplanetary disturbances responsible for geomagnetic storms

Details Solar and interplanetary disturbances responsible for geomagnetic storms Solar and interplanetary disturbances responsible for geomagnetic storms

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jphcs.208a2068s&link_type=abstract

Journal of Physics: Conference Series, Volume 208, Issue 1, pp. 012068 (2010).

Physics

Scientific paper

The geomagnetic storms (GSs) are the large disturbances in the earth's magnetic field. We have selected 142 GSs (Dst <=-150nT) during the period 1996-2007. Isolated geomagnetic storms typically have a main phase of 3-12 hours and a recovery phase exceeding ~3 days. Coronal mass ejections (CMEs) associated with radio bursts are major solar events that are responsible to produce large geomagnetic storms (Dst <=-50nT). Out of 142 events, 77 GSs (-100nT <= Dst <=-50nT), 50 GSs (-200nT <= Dst <=-100nT) and 15 events (Dst <= -200nT) of different magnitudes are found during the said period. The percentage of GSs associated with CMEs is approx 58%, with type II burst is approx 32 % with type IV burst is approx 12 % and the percentage of GSs associated with bright flare is approx 32 %.

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