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Title: First observations of geomagnetic field variations within equatorial electrojet belt in Sri Lanka
Authors: Rastogi, R G
Kitamura, Talichi
Kitamura, Kentarou
Keywords: Equatorial electrojet;Geomagnetic storm;Sri Lanka;Electromagnetic induction
Issue Date: Apr-2004
Publisher: NISCAIR-CSIR, India
PACS No.: 94.30. Lr; 94.30.Kq
Abstract: The daily variations of the geomagnetic horizontal (H), eastward (Y) and vertical (Z) fields at any equatorial electrojet station south of India have been described, for the first time, using the data from Peredinia, Sri Lanka (geogr. lat. 7.3°N, long. 80.6°E, dip lat. 1.3°S). An abnormal positive peak in the daily variation of the Z field at Peredinia (PRD) in the forenoon hours, stronger in magnitude to corresponding abnormality in Z at Trivandrum (TRD), India has been detected. There is a remarkable correspondence between ΔZ at Trivandrum and Peredinia on day-today-basis, the variations being stronger at Peredinia than at Trivandrum. During a magnetic storm a sharp decrease of ΔZ is observed few hours before the maximum decrease of H at both PRD and TRD. These observations show, for the first time, that the induction anomalies in the equatorial electrojet region in Indo-Sri Lanka longitudes extend well beyond the southern tip of Indian Peninsula. The phenomenon of subsurface induction in Indian longitudes needs to be seriously reconsidered.
Page(s): 83-87
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.33(2) [April 2004]

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