Solar daily Geomagnetic Variation in the Low Latitude Region
The solar daily variation in the geomagnetic field at some low latitude stations has been studied from the harmonic analysis of the hourly values of horizontal intensity. The seasonal variations in the amplitudes and phases with geographic, geomagnetic and magnetic latitudes have been examined. It is found that there is no appreciable variation in the amplitude and phase from winter to summer; but the equinoxial amplitudes are highest for the year, while at higher latitudes the summer values are the highest. There is clear indication of geomagnetic control of the S variation, dependence on the magnetic latitude being closer than dependence on the geomagnetic latitude.
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