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The disturbance daily variation of the Earth's field near the magnetic equator

1963; American Geophysical Union; Volume: 68; Issue: 9 Linguagem: Inglês

10.1029/jz068i009p02395

2156-2202

Rosemary Hutton,

Geophysics and Gravity Measurements

The S/sub D/ variations of the horizontal and vertical magnetic elements of the earth's magnetic field at nine mid and lowlatitude stations and of the earth-current components at Legon, Ghana, are presented and discussed. For stations in the region of the equatorial electrojet in Africa, the S/sub D/ variations differ considerably from those at midlatitudes. The difference between the equatorial S/sub D/ and the midlatitude S/sub D/ is found to consist of variations with a midday maximum in H and a midday minimum in Z. This finding suggests that there is either an additional S/sub D/ current near the magnetic equator or an increase in the strength and width of the equatorial electrojet during magnetic disturbance. Also the earth-current S/sub D/ variation is found to agree reasonably well with the derivative of the S/sub D/ variation of the total field F. (auth)