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Title: A new look at the ionospheric current system
Authors: Rastogi, R G
Issue Date: Feb-2003
Publisher: NISCAIR-CSIR, India
Abstract: The paper describes some regional anomalies in the solar daily variations of the northward X and eastward Y geomagnetic field by examining the data from individual stations during the International Geophysical Year (IGY) 1957-58. Around 30-40oN dip latitude the daily range of X showed a minimum and the range of Y a maximum, which is the characteristic of the Sq focus. No definite indications of such phenomenon were seen in the southern hemisphere. The low latitude maximum of Δ X ( around noon changed to midday minimum at high latitudes, not through a flat daily variation at focus latitudes. A forenoon minimum and an afternoon maximum of Δ X occurred at northern focus latitudes. A reverse feature occurred at southern focus latitude. It is suggested that the mid-latitude Sq current system is greatly affected by another low latitude current system as well as by the polar Sq current system. The daily variation of ΔY was reversed in the two hemispheres (the latitude of reversal at around 15oS in J-solstices and around 10oN during D-solstices) which suggests the invasion of summer current system over the winter current system. The global variation of ΔX and ΔY seem to be independent of each other. The direction of equatorial current vector departs significantly from the direction of the normal to the magnetic meridian or from the geographical east. The latitudinal extent of inter-focus currents in Europe-Asian sector contracts in June solstices and expands in December solstices, but in American sector it shifts southward in December and northward in June solstices. These anomalous features of global current system seem to be associated with abnormal distribution of the earth' s magnetic field in the northern and southern hemispheres.
Page(s): 21-37
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.32(1) [February 2003]

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