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Title: Variations in Z during Magnetic Storms at Alibag, Annamalainagar & Trivandrum
Authors: Rajagopal, A S
Nityananda, N
Singh, B P
Issue Date: Mar-1976
Publisher: NISCAIR-CSIR, India
Abstract: The vertical component of the earth's magnetic field, Z, at certain stations shows strong spatial and frequency dependence, during magnetic storms. This behaviour is associated with perturbations in the currents induced within the earth arising from lateral contrasts in the conductivity. Under certain simplifying assumptions, the variations ΔZ, ΔH and ΔD in Z, H and Drespectively are related by the equation ΔZ= AΔH + BΔD where the constants A and B are transfer functions, defining an induction vector which points to the induced currents and hence to the strike of the conducting zone. Storm-time magnetic records of Alibag, Annamalainagar and Trivandrum have been digitized and power spectra of the vertical component (Z) and the horizontal components (H and D) of the earth's field are computed in the period range 32-240 min. From these results, A and B are evaluated. It is shown that the absolute values and the frequency dependence of A and B explain the variations in Z observed at the corresponding station adequately. It is also found that mostly induction vector points to the nearest sea.
Page(s): 50-54
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.05(1) [March 1976]

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