LVI.Systematic wind measurements at altitudes of80–100 kmusing radio echoes from meteor trails

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Abstract
A method for the systematic measurement of winds at altitudes of 80–100 km is described. Wind drifts of ionized meteor trails cause small changes in range of the radio echoes, and these are measured using a coherent pulse doppler technique. The method is able to resolve mean hourly wind speeds and directions on any day. Observations during September and October 1953, have shown that both semi-diurnal and diurnal wind components exist, corresponding to clockwise rotations of the wind vectors. The amplitudes and phases of these components are variable. There is also a prevailing wind which blows towards the east in September, and towards the west in October. The presence of a positive wind gradient of approximately 2·7 m sec-1 km-1 between altitudes of 78 and 98 km has also been established.

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