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|Title:||Ionosphere near the anomaly crest in Indian zone during magnetic storm on 13-14 March 1989|
|Authors:||Chakraborty, S K|
|Abstract:||The storm time responses of the ionosphere near equatorial anomaly crest in the Indian longitude zone during super magnetic storm on 13-14 March 1989 have been studied using (i) total electron content (TEC) and VHF/UHF scintillation data from location near the equatorial anomaly crest (Calcutta), (ii) h/F, foF2 data from an equatorial station Kodaikanal, and (iii) ion density data from Defense Meteorological Satellite Program (DMSP) satellites. Some distinctive features in the storm time variation of the Indian low latitude ionosphere compared to those of the East Asian and western longitude sectors are revealed through the analysis of DMSP ion density data. The h/F and foF2 data of Kodaikanal exhibit some unusual features, i.e. abnormal height rise and corresponding drop of plasma density at equatorial F-layer in the midnight-post-midnight period of both the main and recovery phases of the storm. From Calcutta large depressions in diurnal variation of TEC for two consecutive days marked the disturbed conditions. An abnormal post-midnight enhancement of TEC is also detected. A remarkable feature of storm time responses of the equatorial low latitude ionosphere is the preferential occurrence of scintillation in the path of trans-ionospheric signals from a particular satellite out of two (ETS-2 and FSC) with a longitude separation of 5º. VHF/UHF scintillation observations in the post-midnight period from Calcutta exhibit the longitudinally confined nature of the storm induced ionospheric irregularities. A distinctive feature of scintillation occurrence near the anomaly crest of the Indian and East Asian longitude sectors justifies typical local time dependence of disturbance electric field components. Combined studies on scintillation, TEC, ion density, h/ F, foF2 data produce a coherent picture of the storm time equatorial ionosphere over Indian longitude sector.|
|Appears in Collections:||IJRSP Vol.37(6) [December 2008]|
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