H–Cmes and Ii–Type Radio Bursts Related  Intense Geomagnetic Storms in Relation  With Interplanetary Magnetic Field and  Solar Wind Disturbances

Praveen Kumar Gupta; Puspraj Singh; Devendra Sharma; P. K. Chamadia

Volume : II, Issue : X, October - 2013

H–Cmes and Ii–Type Radio Bursts Related Intense Geomagnetic Storms in Relation With Interplanetary Magnetic Field and Solar Wind Disturbances

Praveen Kumar Gupta, Puspraj Singh, Devendra Sharma, P. K. Chamadia

Abstract :

We have studied H–CMEs and II–type radio bursts related intense geomagnetic storm (Dst≤–100 nT) associated with X–ray solar flare, Interplanetary Magnetic Fields and solar wind disturbances, during the period of 2001–2012. We have found that all the II–type related intense geomagnetic storms are associated with X–ray solar flares of different categories. The association rates of class X, class M, class C and class B, X–ray solar flares have been found 18.18%, 54.55%, 18.18% and 9.09% respectively. Further we have concluded that intense geomagnetic storms are closely related to interplanetary magnetic fields and change in solar wind disturbances (temperature and pressure). Positive co–relation with correlation coefficient 0.63 has been found between magnitude of intense geomagnetic storms and magnitude of change in southward components of interplanetary magnetic field. Further positive co–relation with correlation coefficient 0.63 has been found between magnitude of intense geomagnetic storms and magnitude of change in solar wind plasma temperature and 0.82 between magnitudes of intense geomagnetic storms and magnitude of change in solar wind plasma pressure.