On the detectability of millimeter wavelength spectral lines from planetary atmospheres

Details On the detectability of millimeter wavelength spectral lines from planetary atmospheres On the detectability of millimeter wavelength spectral lines from planetary atmospheres

Sep 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978aj.....83.1122w&link_type=abstract

Astronomical Journal, vol. 83, Sept. 1978, p. 1122-1138.

Astronomy and Astrophysics

Astronomy

Absorption Spectra, Line Spectra, Millimeter Waves, Molecular Spectra, Planetary Atmospheres, Signal Detection, Atmospheric Composition, Atmospheric Models, Jupiter Atmosphere, Mars Atmosphere, Microwave Spectra, Planetary Temperature, Radio Telescopes, Venus Atmosphere, Models, Venus, Mars, Jupiter, Absorption, Spectrum, Earth-Based Observations, Carbon Monoxide, Abundance, Chemical Composition, Radiative Transfer, Atmosphere, Temperatures, Telescopic Observations, Planets, Radio Astronomy, Ammonia, Radioe

Scientific paper

This paper adopts a simple line-formation model to estimate detection limits on the fractional absorption produced by molecular lines in the spectra of the planets, when observed with the 14-m antenna and low-noise receivers of the Five College Radio Astronomy Observatory. The results, which can readily be adjusted for receiver and telescope characteristics of other observatories, indicate that three kinds of observing programs may prove fruitful: (1) programs to monitor temporal variations of the strong CO absorption in the spectrum of Venus and Mars; (2) searches for weak absorption lines of other molecules, which are particularly promising for Venus: and (3) efforts to measure broad features in the continuous spectra of Venus, and possibly Jupiter, produced by molecules deep in the planetary atmospheres. Except for delineation of broad features of NH3 and possibly H2O near 25 GHz, hardly any useful observations can be made at frequencies less than 60 GHz.

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