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Title: Geomagnetic Storm Effects on Ionospheric Total Electron Content in Indian Zone
Authors: Jain, A R
Deshpande, M R
Sethia, G
Rastogi, R G
Singh, Malkiat
Gurm, H S
Lanve, A V
Rai, R K
Issue Date: Apr-1978
Publisher: NISCAIR-CSIR, India
Abstract: The effects of magnetic storms on ionospheric total electron content (TEC) are studied at four stations (viz, Bombay, Ahmedabad, Udaipur and Patiala) in the region of equatorial anomaly using 140'056 MHz radio beacons from ATS-6 for the period 1975-76. Results of major winter storms show that (i) during early night hours following the onset of major storm, large increase in TEC is observed at all the stations and (ii) significant storm time changes occur predominantly during sunlit hours and the effects last for more than three days since the main phase onset. The increase in TEC is noticed more commonly during forenoon hours of day-1 and almost throughout on day-2. Negative phase is also noticed on afternoon of day•1 and also on day-3. Both positive and negative phases are largest at Ahmedabad and Udaipur, less at Bombay and least at Patiala. For one great storm which occurred during summer, a decrease in TEC is noticed at all stations near midday simultaneous to rapid decrease in H field. As in the case of winter storms, for this storm also positive phase was observed on day-2. The storm changes seem to be associated with the position of the station in the low latitude F2-region anomaly itself, and definite negative phase of storm effect in TEC, not commonly reported for low latitudes, has been detected.
Page(s): 111-118
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.07(2) [April 1978]

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