The geomagnetic storms effects and pre storm phenomena on ionospheric F2 regions

A study of the interplanetary and ionospheric response during the intense geomagnetic storm on August 6, 2011, October 25, 2011 and March 9, 2012 Dst (-133nT, -113nT and -137nT) respectively has been presented in an attempt to contribute to the understanding of the magnetospheric process that generate intense magnetic storm. The result shows that the pre- storm phenomena that lead to intense ionosphere storm; the variation of the interplanetary magnetic field Bz component, the plasma Temperature, plasma speed, electric field and plasma beta were considered with the Dst variation of the three Date storms. The ionospheric at the low and low mid-latitudes stations for this storm data were also investigated with regards to F2 region response. The low mid latitude stations are characterized by negative storm, while the low latitude stations characterized by positive storm