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Title: Day-to-day variability of ionospheric current system
Authors: James, M E
Tripathi, D
Rastogi, R G
Issue Date: Feb-1996
Publisher: NISCAIR-CSIR, India
Abstract: Day-to-day variability in the solar daily range of the horizontal component of the geomagnetic field (H) over a unique network of thirteen stations extending from 0° to 60° dip latitude within a narrow longitude belt along with the Indo-USSR sector has been studied. The interrelationships of H between each pair of stations in the network are computed. It has been shown that the correlation of H at an equatorial station, Trivandrum, with H at other stations decreases with increasing latitude, becomes almost zero around 25° lat., negative around 35° lat. and again becomes nearly zero at stations north of the Sq focus latitude. This phenomenon has been suggested to be the resultant of the superimposition of lunar semi-diurnal variations over the solar diurnal (Sq) variations of H. Three partially independent regions of current systems have been identified as (i) equatorial regions (ii) low latitudes equatorward of Sq focus and (iii) middle latitudes north of Sq focus. The daily variations of H at latitudes from 30° to 60° are greatly affected by the superimposition of low latitude Sq and higher latitude current systems, giving rise to a significant minimum of H in the forenoon and a maximum in the afternoon hours at stations on either side of the Sq focus.
Page(s): 36-43
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.25(1) [February 1996]

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