Daily Variation of the Geomagnetic Field at the Dip Equator

Details Daily Variation of the Geomagnetic Field at the Dip Equator Daily Variation of the Geomagnetic Field at the Dip Equator

May 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970natur.226..740n&link_type=abstract

Nature, Volume 226, Issue 5247, pp. 740-741 (1970).

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Scientific paper

THE range ΔHA of the daily variation of the horizontal component of the geomagnetic field at Alibag (A), a low latitude station outside the influence of the equatorial electrojet, is largely caused by weakening of the ambient field on the night side rather than an enhancement on the day side1-3. The effect may be caused by magnetospheric drift currents which, being more than 30,000 km above the surface of the Earth, would produce almost identical effects at Alibag and Trivandrum (T), situated on the dip equator 1,100 km south of Alibag, if differences in the induced field arising from local ground conditions are ignored. On the other hand, the well known enhancement of ΔH at the dip equator is caused by the influence of the equatorial electrojet. Consequently ΔHT-HA must be related to purely ionospheric currents.

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