Interplanetary Transients Causing Moderately Severe Geomagnetic Storms

Details Interplanetary Transients Causing Moderately Severe Geomagnetic Storms Interplanetary Transients Causing Moderately Severe Geomagnetic Storms

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....6.3661y&link_type=abstract

Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I

Physics

Scientific paper

Eight moderately severe (MS) type geomagnetic storms (GMSs) are identified and investigated statistically during the period 1978-80. The interplanetary magnetic field (IMF), B, proton density, DP and proton temperature, TP are enhanced ahead of magnetic clouds that are preceded by a shock, while strong magnetic field density and low TP are southward Bz is a dominant parameter for producing MS type GMSs, whereas Bav , sunspot numbers (SSNs) and V also play a significant role for development of MS type geomagnetic storms. Generally the value of Ap index increases, acquiring maximum value on the day of maximum activity. In 50% events the decrease in CR intensity starts few hours earlier than the arrival of shock associated magnetic cloud at earth, while in 25% events, it starts at the time of occurrence of MS type GMSs at earth with no cloud event at earth.

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