The solar and lunar daily variations of earth currents near the magnetic equator

Details The solar and lunar daily variations of earth currents near the magnetic equator The solar and lunar daily variations of earth currents near the magnetic equator

Aug 1962

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1962jatp...24..673h&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 24, no. 8, pp. 673-680

Physics

Scientific paper

The results of analyses of earth current measurements at two stations in Ghana--Legon (5°38'N, 0°11'W) and Tamale (9°25'N, 0°53'W)--are discussed and it is suggested that in the equatorial region, the electrojet causes an enhancement of the solar daily variation of the earth currents by a factor of 6 or less. To account for the seasonal change in the Sq variation, it is suggested that there may he a seasonal shift in the mean position of the Sq current system and of the electrojet. The annual mean SD hodograph has been constructed and shows a marked deviation from its average behaviour at approximately 1800 hours. An estimate of the magnitude of the lunar variation of the earth currents at Legon has also been obtained from one year's data. It is approximately 12 per cent of the solar daily variation.

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