Abstract

Choosing quiet days in 1964 wnen counter-electrojets occurred at the equatorial station Trivandrum in India, the H, X and Y variations were examined at northern locations in the same longitude zone. It was noticed that, in summer (May, June, July, August) nothing abnormal happened at the low and middle latitudes. But in winter and equinoxes, strong equatorial counter-electrojets were associated with larger amplitudes of H, X and Y at low and middle latitudes. Thus, equatorial counter-electrojets may be related to intensifications of the winter hemisphere Sq current systems. A preliminary analysis for Huancayo at equator and Fuquene at a low latitude in the American zone did not reveal any similar consistent relationship. This needs furthur investigation.

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