Relation between Solar Wind Parameter and Geomagnetic Storm Condition during Cycle-23
| Autor: | Dinesh C. Gupta, Balveer S. Rathore, K. K. Parashar |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Physics
Geomagnetic storm Ionospheric dynamo region Geomagnetic secular variation Solar cycle 23 Geophysics Atmospheric sciences Physics::Geophysics Solar wind Earth's magnetic field Physics::Space Physics Disturbance storm time index May 1921 geomagnetic storm Physics::Atmospheric and Oceanic Physics |
| Zdroj: | International Journal of Geosciences. :1602-1608 |
| ISSN: | 2156-8367 2156-8359 |
| DOI: | 10.4236/ijg.2014.513131 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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