Meridional equatorial electrojet current in the American sector |
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Authors: | R. G. Rastogi |
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Affiliation: | (1) INSA Senior Scientist, Gujarat University, Ahmedabad, 380 009;(2) Visiting Scientist Physical Research Laboratory, Ahmedabad |
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Abstract: | Huancayo is the only equatorial electrojet station where the daytime increase of horizontal geomagnetic field (H) is associated with a simultaneous increase of eastward geomagnetic field (Y). It is shown that during the counter electrojet period when H is negative, Y also becomes negative. Thus, the diurnal variation of Y at equatorial latitudes is suggested to be a constituent part of the equatorial electrojet current system. Solar flares are known to increase the H field at an equatorial station during normal electrojet conditions (nej). At Huancayo, situated north of the magnetic equator, the solar flare effect, during nej, consists of positive impulses in H and Y and negative impulse in Z field. During counter electrojet periods (cej), a solar flare produces a negative impulse in H and Y and a positive impulse in Z at Huancayo. It is concluded that both the zonal and meridional components of the equatorial electrojet in American longitudes, as in Indian longitudes, flows in the same, E region of the ionosphere. |
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Keywords: | Geomagnetism and paleomagnetism (dynamo theories) Ionosphere (equatorial ionosphere ionosphere disturbances) |
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