TITLE:
Relation between Solar Wind Parameter and Geomagnetic Storm Condition during Cycle-23
AUTHORS:
Balveer S. Rathore, Dinesh C. Gupta, K. K. Parashar
KEYWORDS:
Geomagnetic Storm, Interplanetary Magnetic Field (IMF), Disturbance Storm Time (Dst), Solar Cycle
JOURNAL NAME:
International Journal of Geosciences,
Vol.5 No.13,
December
26,
2014
ABSTRACT: In the present paper
dependence of geomagnetic activity on the solar-wind plasma and interplanetary
magnetic field (IMF) parameters has been studied. We have taken interplanetary
solar wind data at the instant of Dst minimum. Our study consists of 200
geomagnetic storms weighed by disturbance storm time (Dst) -50 nT, observed during solar cycle
23. The study suggests that the strength of the geomagnetic storm is strongly
dependent on the total magnetic field Btotal. The correlation (-0.72)
has been found reasonable. In perspective of previous studies, the strength of
the geomagnetic storm is strongly dependent on the southward component (Bz)
whereas in present study exposes that the correlation (0.22) is weak. This
result indicates that solar wind southward magnetic field component Bz has
significant growth particularly before the main phase of geomagnetic storm (not
during the main phase). The present result implies that neither density nor
temperature is significantly related to the variation of geomagnetic
disturbance; rather the effects of the pressure and speed. However, a low
plasma beta during highly geoeffective event seems to be an important
criterion.