Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.1917h&link_type=abstract
American Astronomical Society, DPS meeting #39, #19.17; Bulletin of the American Astronomical Society, Vol. 39, p.447
Astronomy and Astrophysics
Astronomy
Scientific paper
New laboratory measurements of the microwave opacity of ammonia in a hydrogen/helium atmosphere up to pressures of 12 bars have been performed using the high-precision microwave measurement system developed at Georgia Tech. These measurements have an increased accuracy and reliability over all previous measurements due to new procedures to combat the uncertainty from ammonia adsorption in the test chambers combined with enhanced data processing algorithms. Laboratory data are presented of the measured microwave opacity of various gas mixtures of hydrogen ( 85.5%), helium ( 13.5%), and ammonia (0.25-4%) at temperatures between 217 and 450 K and pressures between 0.031 and 12 bars. These data were taken at around two-dozen wavelengths from 1.25 to 20 cm as well as additional wavelengths at K/Ka-Band from 0.8 to 1.3 cm at 295 K and pressures up to 3 bars. The results will be used in constructing a new model for the microwave absorption coefficient of ammonia in the Jovian atmosphere, which will enable more accurate retrieval of ammonia abundances from the Galileo Entry Probe data, Cassini radio occultations, and the Juno Microwave Radiometer (MWR).
This work is supported by NASA under Subcontract 699054X from SwRI supporting the Juno Mission Science Team. Additional support was provided by the NASA Planetary Atmospheres Program under Grant NNG06GF34G.
Hanley Thomas Ryan
Steffes Paul Gregory
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