Internal induction by the equatorial electrojet in India examined with surface and satellite geomagnetic observations

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Equatorial Electrojet, Geomagnetism, Magnetic Induction, Satellite Observation, Atmospheric Models, India, Magnetic Surveys, Tables (Data)

Scientific paper

Extrapolation to satellite heights of the surface electrojet field at Trivandrum on 47 fairly quiet days for comparison with jet signatures reported from POGO data suggests, on the basis of a parabolic current-band model of the electrojet, generation by the electrojet of an internal induction field equivalent to that of an image electrojet of about 1000 km depth. Extrapolation on the basis of a two-band model of half-widths 350 and 700 km and central current intensities I sub zero and either -I sub zero/2 or I sub zero/3 for the main and subsidiary bands respectively, with no induction field included, indicates, on the other hand, values comparable with the jet signatures. No definite conclusion regarding generation of induction within the earth by the electrojet emerges but the internal field contribution is smaller than magnitudes assumed hitherto.

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