  Geomagnetic field variations during five major Solar Energetic Particle (SEP)
events of solar cycle 23 have been investigated in the present study. The SEP
events of 01 oct 2001, 04 Nov 2001, 21 Apr 2002 and 14 May 2005 have been
selected to study the geomagnetic field variations at two high-latitude
stations, Thule and Resolute Bay of the northern polar cap. We have used the
GOES protn flux in seven different energy channels. All the proton events were
associated with geoeffective or Earth directed CMEs that caused intense
geomagnetic storms in response to geospace. We have taken high-latitude
indices, AE and PC, under consideration and found fairly good correlation of
thees with the ground magnetic field records during the five proton events. The
departure of H component during the events were calculated from the quietest
day of the month for each event. The correspondence of spectral index, inferred
from event integrated spectra, with ground magnetic signatures along with Dst
and PC indices have been brought out. From the correlation analysis we found
very strong correlation to exist between the geomagnetic field variations and
high latitude indices AE and PC. To find the association of geomagnetic storm
intensity with proton and geomagnetic field variations along with the Dst and
AE index. We found a strong correlation (0.88) to exist between the spectral
indices and magnetic field deviations and also between spectral indices and AE
and PC.
