Vertical winds as a plausible cause for equatorial counter electrojet

Details Vertical winds as a plausible cause for equatorial counter electrojet Vertical winds as a plausible cause for equatorial counter electrojet

May 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980georl...7..357r&link_type=abstract

Geophysical Research Letters, vol. 7, May 1980, p. 357-360. Research supported by the Department of Space and Space Commission.

Physics

14

Equatorial Electrojet, Mathematical Models, Reversed Flow, Vertical Air Currents, Wind (Meteorology), Diurnal Variations, Geomagnetism, Magnetometers, Satellite-Borne Instruments, Vertical Distribution

Scientific paper

The signatures of the counterelectrojet that occurs in the afternoon hours as recorded on the ground and satellite-borne magnetometers during magnetically quiet days clearly indicate reversal of the jet current in a narrow latitude region centered around the dip equator. The latitudinal variation of the vertical and northward components of the earth's magnetic field reveal that the decrease and reversal of the eastward toroidal current of the jet is maximum around the dip equator. By numerically solving the equations governing the electrojet including the terms due to local winds it is shown that vertically upward winds of 15 - 20 m/s are most effective in producing the counterelectrojet. The profile of vertical winds adopted in the model calculations was actually measured during twilight hours. It is shown that the latitudinal variations of the vertical and northward magnetic field components observed during the counterelectrojet can be reproduced satisfactorily by the vertical wind hypothesis. A rocket experiment is suggested to verify the presence of vertical winds during the counterelectrojet.

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