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Title: IEC Variations during Geomagnetic Storms at Delhi
Authors: Bhuyan, P K
Tyagi, Tuhi Ram
Singh, Lakha
Somayajulu, Y V
Issue Date: Oct-1984
Publisher: NISCAIR-CSIR, India
Abstract: lonospheric electron content (IEC) measurements made at Delhi (lat., 28.6°N; long., 77.2°E) with the help of geostationary satellite radio beacon during the ascending half of the solar cycle (1975-80) have been used to investigate the· response of F-region ionization to geomagnetic storms. A total of 35 storms have been used to obtain the average storm time (Dst) and local time (SD) behaviour pattern of IEC. In general, IEC shows enhancements during the course of a storm except for negative phases of short duration during nighttime. Maximum enhancements have been observed in the pre-noon hours of the second day or after 40-48 hr of storm commencement. The corresponding average equatorial Dst (H) index in these periods shows maximum negative excursions. The average pattern seems to have distinct seasonal characteristics. Also, the response of IEC to increased geomagnetic activity has distinct local time bias.
Page(s): 139-142
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.13(5) [October 1984]

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