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Title: Day-to-day variations of geomagnetic declination in Indo-Russian longitude sector
Authors: James, M E
Rastogi, R G
Issue Date: Dec-1997
Publisher: NISCAIR-CSIR, India
Abstract: Day-to-day variability of the eastward component of geomagnetic field (Y) during a quiet period at a unique chain of thirteen geomagnetic observatories extending from 0° to 60° dip latitude within a narrow belt around 145°E geomagnetic meridian has been analyzed. The daily variations of the horizontal field (H) and geographic east component (Y) depart considerably from what is expected from the classical ionospheric current system described in literature. The correlations of DY between any two pairs of stations are higher as compared to the corresponding values for H field. The correlation for Yrange, Ymax or Ymin at Trivandrum with those of other stations decreases with increasing distance reaching a value of 0.5 at 40° dip latitude. At low latitudes, the Yrange is correlated better with Ymin than with Ymax. the differences in latitudinal variations of the correlation coefficients of both the Hrange(RH) and Yrange (RY) are interpreted in terms of the superposition of the lunar semi-diurnal current system over global Sq current system. This develops a region between 20° and 40° dip latitudes with the zonal components of the two current systems opposing each other on some days and adding each other on other days without seriously affecting the meridional current components.
Page(s): 332-339
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.26(6) [December 1997]

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