Title :
A Note on Brightness Temperature at Millimeter Wavelengths
Author_Institution :
Aerojet ElectroSystems Company Azusa, California 91702
fDate :
4/1/1975 12:00:00 AM
Abstract :
The first-order correction to the approximate proportionality between the brightness temperature and the specific intensity of radiation which is usually assumed to hold in the near earth environment at microwave frequencies is examined. Corrections as large as 7°K in the vicinity of 300 GHz are shown to be required. It is shown that the influence of this correction can be incorporated into solutions of the low frequency form of the radiative transfer equation simply by a change in the boundary conditions describing the downward flowing flux at the top of the earth´s atmosphere.
Keywords :
Atmosphere; Boundary conditions; Brightness temperature; Earth; Equations; Geophysical measurements; Microwave frequencies; Microwave radiometry; Millimeter wave measurements; Wavelength measurement;
Journal_Title :
Geoscience Electronics, IEEE Transactions on
DOI :
10.1109/TGE.1975.294380