Apparent Temperatures of Some Terrestrial Materials and the Sun at 4.3 Millimeter Wavelengths

摘要

This report describes the 4. 3 millimeter radiometer and its operational characteristics, the temperature of various terrestrial materials, the attenuation through the atmosphere and the temperature of the sun. The temperatures of the terrestrial materials were measured for vertical and horizontal polarization over an angular range from normal incidence to near grazing. The attenuation vertically through the atmosphere ranged between 1.6 and 2. 3 decibels during the measurement program. The sun of optical disk size was found to be between 10 and 1.2x 10 degree Kelvin on May 3 and June 17 of 1957. Since the apparent temperature of She materials measured is dependent upon their reflectivity, a measure of the reflecting characteristics of water, wood, meta, grass, asphalt, gravel and asbestos at 4.3 millimeter wavelengths was obtained.