Abstract

The diurnal variation of air density at 205 km, deduced from changes in the orbit of Sputnik 3 satellite, is shown to have different characteristics in the low and high latitude regions of the southern hemisphere. At lower latitudes the maximum density occurs at 1400 hours L.T. and is 17 per cent greater than the minimum density, while at higher latitudes the maximum density occurs at 1700 hours and is 12 per cent greater than the minimum.

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