Physics
Scientific paper
Mar 1966
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1966jatp...28..319c&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 28, no. 3, pp. 319-322
Physics
Scientific paper
Calculations have been made of the noise temperature spectrum that would be observed by a satellite-borne millimetre wavelength radiometer operating at frequencies close to the 1- molecular rotation line of O2 at [nu]0 = 118.7505 Gc/s (2.53 mm), taking into account the effects of pressure and Doppler broadening, and of Zeeman splitting in the presence of the terrestrial magnetic field. One important feature of the spectrum is a deep inversion which appears in the centre of the main peak. This inversion can be identified as resulting from the kinetic temperature minimum in the D-region of the ionosphere; and the noise temperature of this inversion (i.e. at [nu]0) gives the average kinetic temperature at a height of 82 ± 6 km. By using a radiometer which switches rapidly from left-handed to right-handed circular polarization to measure the effects of Zeeman splitting on this inversion, it might prove possible to measure small variations in magnetic field intensity in the D-region, at about 82 km, using a remote geostationary satellite, though this would require a radiometer at least 100 times more sensitive than is currently available.
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