THE RESPONSE OF POLAR, EQUATORIAL AND LOW LATITUDE IONOSPHERE TO THE MINOR MAGNETIC DISTURBANCE OF 11 OCTOBER 2008

摘要

GPS technique is widely used to study the global structure and dynamics of the ionosphere. The present paper investigates the response of polar, equatorial and low latitude ionosphere over the Antarctica and Indian region during the end of 23 solar cycle period, the event occurred on 11 October 2008 the response of ionospheric total electron content (TEC) in duration of minor magnetic field disturbance is derived from Global Positioning System (GPS) at locations of Maitri (-70.65 N, 11.45 E), Trivandrum (8.5 N, 77 E) and Delhi (28N, 77 E). On sudden storm commencement, the TEC at Maitri showed a 50% enhancement and the rate of change of TEC (TECR) shows changeability between -3 to +3 TECU when compared with its regular pattern associated with magnetic storm in high latitude region Antarctica but at both stations equatorial (Trivandrum) and low latitude (Delhi) the variation of TEC and rate of change of TEC (TECR) does not show any enhancement during this minor storm period.