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IJCRR. 2012; 4(22): 01-07


STATISTICAL RELATION OF SOLAR FEATURES AND SOLAR WIND PLASMA PARAMETERS WITH INTERPLANETARY SHOCK RELATED GEOMAGNETIC STORMS

P.L.Verma, Preetam Singh, Monika Mishra, Manoj Kumar Mishra, Arun Kumar.

Abstract
We have studied geomagnetic storm ≤-80 nT, associated with interplanetary shocks, observed during the period of 2000- 2010 with coronal mass ejections and solar wind plasma parameters. We have found that most of the shock related geomagnetic storms are intense are severe. The association rates of moderate, intense and severe shock related geomagnetic storms have been found 21.88%, 59.38% and 18.75% respectively. Further it is observed that maximum of them (81.25%) are associated with coronal mass ejections. The association rates of halo and partial halo coronal mass ejections have been found 82.69% and 17.31% respectively. It is also concluded that majority of them are associated with radio bursts (71.88%). The association rates of type IV and type II radio bursts have been found 58.70% and 41.30% respectively. From the further analysis, positive co-relation has been found between magnitude of interplanetary shock related geomagnetic storms and magnitude of jump in solar wind plasma temperature ,velocity, pressure and peak value of interplanetary magnetic fields, southward component of interplanetary magnetic fields with correlation coefficient 0.33 between magnitude of interplanetary shock related geomagnetic storms and magnitude of jump in solar wind plasma temperature,0.40 between magnitude of interplanetary shock related geomagnetic storms and magnitude of jump in solar wind plasma velocity, 0.26 between magnitude of geomagnetic storms and magnitude of jump in solar wind plasma pressure,0.71 between magnitude of shock related geomagnetic storms and maximum (peak) value of average interplanetary magnetic field (JIMF),0.78 between magnitude of shock related geomagnetic storms and magnitude of maximum (peak) value of southward component of interplanetary magnetic field.

Key words: Geomagnetic storms, interplanetary shocks, coronal mass ejections, solar wind plasma parameters.



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