Abstract:

We have studied radio bursts (RB) related geomagnetic storm of magnitude ≤-90 nT, during the period of 1997- 2008 with coronal mass ejections and solar wind disturbances. We have found that most of the RB related geomagnetic storms are found to be associated with coronal mass ejections (CMEs). Out of 42 geomagnetic storms 37 (88.09%) geomagnetic storms are found to be associated with coronal mass ejections (CMEs). Most of the CMEs are associated with halo and partial halo CMEs the association rates are 67.57% and 32.43% respectively. It was concluded that there is a positive correlation between magnitude of radio bursts related geomagnetic storms and speed of associated CMEs.Further we have concluded that geomagnetic storms are closely related to solar wind disturbances (density and pressure). Positive co-relation with correlation coefficient 0.26 has been found between magnitude of geomagnetic storms and magnitude of change in solar wind plasma density and 0.41 between magnitudes of geomagnetic storms and magnitude of change in solar wind plasma pressure.

Keywords: Geomagnetic storms, coronal mass ejections, solar wind disturbances, Radio bursts.

Preetam Singh Gour, Arun Kumar & Shiva Soni

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