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John R. Gerhardt

A research program involving the study of the attenuation and backscattering by rain of millimeter wavelength radiation has resulted in the requirement for very accurate measurements of rainfall characteristics along paths ranging from 1000 to 2000 ft. A special continuous-wire raingage has been developed which gives an essentially continuous rainfall response by measuring the water level in a cylindrical gage. An accuracy of 0.001 in of rain is obtainable. The responses from two of these gages are compared with those from a number of modified tipping bucket and other gages for several rains in the Austin area.

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John R. Gerhardt
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John R. Gerhardt
and
William E. Gordon

Abstract

Selected portions of microtemperature data obtained continuously and with near simultaneity at several levels up to six feet over a desert surface are plotted on expanded height-time coordinates. The resulting isotherm patterns are shown to be strikingly consistent at all levels and are qualitatively analyzed in relation to the turbulence field present. Correlation coefficients between temperature fluctuations simultaneously at two levels and at a point for various time intervals are evaluated and their variation with separation, time, wind speed, and thermal stability is discussed. Tentative intensity and scale measures of turbulence derived from iemperature data are presented.

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John R. Gerhardt
and
William E. Gordon

The propagation of radio waves above about 30 megacycles is seriously affected by certain weather phenomena. The meteorological aspects of this effect for a particular case are considered and a forecasting technique proposed.

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