Geomagnetic plasma probe for solar wind

Sarabhai, V. ; Nair, K. N. (1969) Geomagnetic plasma probe for solar wind Proceedings of the Indian Academy of Sciences - Mathematical Sciences, 69 (6). pp. 291-306. ISSN 0253-4142

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Magnetograms from Alibag reveal that the range Δ H of the daily variation of the horizontal component is negatively correlated with the minimum value ΔHmin, during a day. This relationship is largely unaffected by the degree of geomagnetic disturbance and holds good during all phases of the 11-year cycle of solar activity. From the nature of the relationship between ΔH and ΔHmin. it is concluded that the daily variation of the geomagnetic field at a low latitude station outside the influence of the equatorial electroject must be regarded as largely due to a weakening of the ambient field on the night side rather than an enhancement of the field on the day side due to ionospheric currents. There exists a good correlation between (ΔH)2 and the kinetic energy density of the solar wind in interplanetary space measured by IMP-1 satellite. It is suggested that ΔH is largely the result of the partial ring currents related to the convective drift of the plasma from the tail of the magnetosphere. Moreover, using the relationships established during the IMP-1 period, the annual mean kinetic energy density of solar wind for geomagnetically quiet days for the past 11-year cycle is estimated, treating the earth as a plasma probe.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:34166
Deposited On:30 Mar 2011 10:39
Last Modified:17 May 2016 17:04

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