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Title: A new relationship between geomagnetic H and Y fields during disturbed conditions
Authors: Rastogi, R G
Issue Date: Oct-1996
Publisher: NISCAIR-CSIR, India
Abstract: The effect of geomagnetic disturbance activity on both the northward (H) and the eastward (Y) components of the geomagnetic field at stations within 0° to 60° dip latitudes along a narrow longitude sector along India and former USSR states is described for the first time. The difference between monthly mean values of both H and Y fields averages on five International Quiet days and on five International Disturbed days varied very sympathetically with the corresponding variation of the monthly mean equatorial Dst index, which is considered to depict the strength of equatorial ring current in the magnetosphere. Averaged over all the stations, a decrease of H field by 70 nT corresponded to an increase of Y field by about 14 nT. At any of the stations, the daily mean value of the H field shows linear decrease with increasing daily sum of Ap index while the daily mean value of Y field shows linear increase with daily sum of Ap index during any of the seasons of the year. The latitudinal variation of the slope of the regression line for H field decreases as the cosine of the geomagnetic latitude while the same for Y field increases as the secant of the geomagnetic latitude. Thus, a systematic increase of the eastward magnetic field is shown, associated with the increasing equatorial ring current for any of the stations in the Indo-Russian longitude sector.
Page(s): 300-307
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.25(5) [October 1996]

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