Abstract
An attempt has been made to reproduce the counter electrojet (CE) in the equatorial dynamo by considering neutral winds with solar (1,–2), (2, 4), (2, 2) and lunar (2, 2) tidal modes as well as a constant electrostatic field ( E y ). The daily variation of conductivity (σ) is assumed to consist of steady (average), diurnal and semi-diurnal components. An equation governing the relationship between j y (jetcurrent), E y , σ and wind is given, and this equation is then used to describe diurnal, semi- and ter-diurnal variations of j y separately. It is found that: (1) the lunar tide is relatively powerful in affecting semi- and ter-diurnal components of j y ; (2) such a possibility is a maximum for the afternoon CE near new and full moon and (3) the morning CE is likely to occur at lunar age between the new and full moons. From this theory, the seasonal characteristics and the solar activity dependence of CE are demonstrated to be predictable.
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