Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.6213h&link_type=abstract
American Astronomical Society, DPS meeting #38, #62.13; Bulletin of the American Astronomical Society, Vol. 38, p.608
Astronomy and Astrophysics
Astronomy
Scientific paper
New laboratory measurements of the microwave opacity of ammonia in a hydrogen/helium atmosphere have been performed using the improved high-precision microwave measurement system developed at Georgia Tech (see accompanying abstract "An Enhanced System for Laboratory Measurements of the Centimeter-Wave Properties of Ammonia under Simulated Conditions for the Outer Planets"). These measurements have an increased accuracy and reliability over all previous measurements due to a greater understanding of the nature of ammonia adsorption and gas mixing in the test chambers combined with enhanced data processing algorithms. The improved accuracy allows selection of the best fitting models at various temperatures, pressures and wavelengths, which in turn allows for better retrievals of the abundance of ammonia in the outer planets from microwave brightness temperature measurements, entry probe radio links, and radio occultation studies. Laboratory data are presented of the measured microwave opacity of various gas mixtures of hydrogen ( 85.5%), helium ( 13.5%), and ammonia (0.5-1%) at temperatures between 187 and 297 K and pressures between 0.5 and 6 bars. These data were taken at close to two dozen wavelengths from 1.1 to 20 cm as well as additional wavelengths at Ka-Band from 0.8 to 1.0 cm at 295 K and pressures up to 2 bars. These results, plus future measurements conducted under the higher pressures and temperatures characteristic of the deeper atmospheres of the outer planets will be of direct application to missions such as Juno and Cassini.
Hanley Thomas Ryan
Steffes Paul Gregory
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