The microwave spectra of planets

Details The microwave spectra of planets The microwave spectra of planets

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aipc..616..330e&link_type=abstract

EXPERIMENTAL COSMOLOGY AT MILLIMETRE WAVELENGTHS: 2K1BC Workshop. Breuil-Cervinia, Valle d'Aosta, Italy, 9-13 July, 2001. Edit

Physics

1

Radio, Microwave, Submillimeter, Venus, Mars, Jupiter, Saturn

Scientific paper

This paper reviews our current knowledge of the spectra of planets, from the centimeter to the submillimeter range, both from an observational and a theoretical point of view. In the case of Venus, due to its very thick CO2 atmosphere, the spectrum is dominated by the pressure-induced CO2 absorption, with some other contributions from minor constituents (SO2,H2O). In the case of Mars, which has a very tenuous atmosphere, the microwave spectrum is composed of discrete narrow molecular lines of CO, H2O and their isotopes, superimposed over a continuum defined by the surface emissivity and temperature. The microwave spectra of the giant planets probe their tropospheres. They are dominated by collision-induced absorption, mostly due to H2-H2 and H2-He collisions, with, in the case of Jupiter and Saturn, additional features due to NH3 and PH3. For all cases, observed and synthetic spectra are described, and the various sources of uncertainty are discussed. .

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