Physics
Scientific paper
Jun 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980ang....36..231b&link_type=abstract
Annales de Geophysique, vol. 36, Apr.-June 1980, p. 231-239.
Physics
Counterflow, Diurnal Variations, Equatorial Electrojet, Magnetic Flux, Annual Variations, Causes, Geomagnetism, Harmonic Motion, Lunar Effects, Mathematical Models, Solar Energy, Tables (Data)
Scientific paper
Observations of the equatorial afternoon counter-electrojet are examined in order to determine the source mechanism for the phenomenon. Days of the years 1961-1976 are classified in terms of an appropriate counter-electrojet index based on hourly magnetic data from observatories near the equatorial electrojet axis and outside its influence. It is found that 52 percent of the days in the period under consideration are counter-electrojet days. The determination of the solar and lunar harmonics contributing to the field variation reveals a strong seasonal dependence of the source, with lunar control effective only in winter when it accounts for 25 percent of the events. Results are interpreted to suggest that the counter-electrojets are caused by the superposition of the lunar geomagnetic field wave over the solar wave in winter, that an important role may be played by local tides in the equatorial region at the solstices, and that the counter-electrojet effects at the equinoxes can be accounted for by a combination of the (1,-2), (2,2) and (2,4) modes.
Arora Baldev R.
Bhargava B. N.
Rajaram Ramaswamy
Sastri N. S.
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