Study of One of the Largest Space Weather Event of Solar Cycle 23: Events of November 2004

In this paper, we discuss the solar origin and interplanetary consequences of the coronal mass ejections of November, 2004 which was one of the largest space weather events of Solar Cycle 23 and also one of the most difficult periods to forecast. Nine halo coronal mass ejections (CMEs), interacting on their way through the interplanetary medium and forming two complex geo-effective ICME structures which reached to the Earth on 7-8 and 9-10 November, whereas the later, more rapid CMEs seems to be non geo-effective. The Dst reached to -373 nT for the duration of 7--8 November and -289 nT for the duration of 9-10 November and the Kp index was 9 for 2-3 hour periods during every storms.