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Title: Geomagnetic Storm Effects on Ionospheric Total Electron Content in Indian Zone - Part II : Evidence of Equatorial Electrojet Control through Fountain Effect
Authors: Jain, A R
Deshpande, M R
Sethia, G
Rastogi, R G
Singh, Malkiat
Gurm, H S
Janve, A V
Rai, R K
Issue Date: Oct-1978
Publisher: NISCAIR-CSIR, India
Abstract: Observations of ionospheric total electron content (TEC) for four stations in the equatorial anomaly region and for live major storms are analyzed in conjunction with f0F2 data of the equatorial station Trivandrum and the index of the strength of equatorial electrojet determined using ground-based magnetic data for Trivandrum and a low-latitude station Alibag. It is shown that qualitatively the variations in equatorial electrojet intensity are responsible for the significant daytime storm effects in TEC at these latitudes. Evidence of the "fountain effect" On storm days is provided by (i) significant negative correlation between electrojet strength and NmF2 for Trivandrum and (ii) significant negative correlation between changes in NmF2 for Trivandrum and change in the TEC at stations in anomaly region with diffusion time equal to 2 hr. The results suggest that changes in E X B drift contribute significantly to daytime storm effects in TEC at stations in the anomaly region. Some abnormal increases in TEC which could not be explained on the basis of E X B drifts are suggested to be due to the effects of equatorial winds from higher latitudes during the geomagnetically disturbed periods.
Page(s): 254-261
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.07(5) [October 1978]

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