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Title: Equatorial electrojet in the African sector
Authors: Rastogi, R G
Chandra, H
Keywords: Equatorial electrojet;Geomagnetic deviation
Issue Date: Dec-2015
Publisher: NISCAIR-CSIR, India
PACS No.: 94.20.dt; 94.20Ss; 94.20Wh
Abstract: Hourly values of the deviations in the geomagnetic X and Y field at two equatorial electrojet stations in Africa, viz. Freetown (FTN) on the western part and Addis Ababa (AAE) on the eastern part, are studied for three years 1962-64. The declination is almost along the geographic N-S at AAE and 14° towards west of the geographic N-S at FTN. The annual mean daily range in X is around 80 nT at FTN and 70 nT at AAE with peak around 1100 hrs LT. Deviations in Y at FTN show a broad minimum of about -20 nT around noon while the decrease is much smaller at AAE with a minimum of -5 nT at noon. Seasonal mean variations of the daily range in X show almost equal peaks during December solstice and equinox at FTN but at AAE it is highest during equinoctial months and lowest during June solstice. The seasonal asymmetry at FTN could be due to large declination. The equinoctial peak in March - April is higher than the peak in September - October at both the stations. Another notable feature at FTN is the steady increase in deviation in X from about -10 nT at 1800 hrs LT to 10 nT at 0600 hrs LT. The direction of the H vector is aligned almost along the geographic N-S for December solstice and equinox at AAE and along 12° W of north during June solstice. At FTN, it is aligned along about 5° W of north during D and E-months and to about 20° W of north during June solstice.
Page(s): 187-198
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.44(4) [December 2015]

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