The solar brightness temperature at millimeter wavelengths

Details The solar brightness temperature at millimeter wavelengths The solar brightness temperature at millimeter wavelengths

May 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976soph...48...41k&link_type=abstract

Solar Physics, vol. 48, May 1976, p. 41-48.

Physics

7

Brightness Temperature, Microwave Emission, Millimeter Waves, Radiation Measurement, Solar Radiation, Calibrating, Extremely High Frequencies, Microwave Radiometers, Solar Spectra, Solar Temperature, Superheterodyne Receivers

Scientific paper

Measurements of the brightness temperature of the sun near 36 GHz and 93 GHz were made using the new moon as a calibration source. Provided the brightness temperature of the moon is known and all measurements are reduced to the same zenith angle, a simple expression can be used for the sun-to-new moon ratio which is independent of antenna gain, atmospheric absorption and reemission, and radiometer calibration constants. This ratio was measured near 36 GHz and at two frequencies near 93 GHz with a Dicke switched superheterodyne radiometer system and a 2.4 m Cassegrain antenna. The slopes of the solar brightness temperature spectrum based on these ratios were measured. The absolute solar brightness spectrum derived from all current available measurements supplemented by the present ones is also plotted and discussed.

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