Storm-time disturbance field and the computed equatorial Dst index

A new approach is proposed to compute the Dst index using observed horizontal field intensity at low latitudes, which incorporates certain normalization factors for removing the part associated with the quiet-time ionospheric current and the elimination of the secular trend. Systematic correspondenc...

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Bibliographic Details
Published in:Indian journal of radio & space physics 1998-04, Vol.27 (2), p.76-81
Main Authors: Mukherjee, S, Alex, S, Rangarajan, G K
Format: Article
Language:English
Online Access:Get full text
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Summary:A new approach is proposed to compute the Dst index using observed horizontal field intensity at low latitudes, which incorporates certain normalization factors for removing the part associated with the quiet-time ionospheric current and the elimination of the secular trend. Systematic correspondence between the conventional equatorial Dst index Dst(cv) and the computed Dst is shown to exist. Since the spacing of stations used for the calculation of Dst(cv) is nonuniform, too large, and far from ideal, an attempt is made to compute the Dst index by the inclusion of an additional station in the Indian longitude, covering a wide gap. Progressive change in the asymmetric component after the inclusion of the station in the computation of Dst is brought out from the analysis. (Author)
ISSN:0367-8393