Role of ambient solar wind conditions in CME evolution

A large variety of solar events are held responsible for producing geoeffective magnetic storms at the Earth. Besides Coronal Mass Ejection (CME), high speed streams emanating either from coronal hole or flare region are also held responsible for events at the Earth even during the period of positive Interplanetary Magnetic Field (IMF) i.e. during October-November 2004. CMEs and other Solar events occurred during 1998-2004 are studied. The effects produced at the Earth during the same period are considered and an attempt has been made to associate them with solar counterparts. This is to draw some conclusion about how some of the events become geoeffective.