Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dps....40.4908k&link_type=abstract
American Astronomical Society, DPS meeting #40, #49.08; Bulletin of the American Astronomical Society, Vol. 40, p.486
Astronomy and Astrophysics
Astronomy
Scientific paper
In recent years, an improved laboratory measurement system was developed at Georgia Tech to measure opacities of trace constituents in a hydrogen/helium atmosphere at wavelengths from 1.1 to 20 cm, pressures up to 12 bars and temperatures from 185 to 550 K. However, the Juno mission will include a microwave radiometer instrument (MWR) capable of sensing centimeter-wavelength emission from the very deep atmosphere of Jupiter at pressures exceeding 100 Bars (Janssen et al., 2005, Icarus 171, 447-453). In order to accurately retrieve the abundances of microwave absorbing constituents such as water vapor, and ammonia from measurements of the centimeter-wave emission from these deep layers, precise knowledge of the absorptive properties of these gases under deep atmospheric conditions is necessary. To date, only a very limited number of measurements have been made of the microwave absorption of water vapor, or ammonia at such high pressures, and none of these measurements were conducted at wavelengths greater than 3.3 cm.
The system developed enables the measurement of water vapor, and ammonia opacity in a hydrogen/helium atmosphere at wavelengths from 5 to 22 cm, pressures up to 100 bars, and temperatures from 295 to 600 K, corresponding to the deep atmosphere of Jupiter. The first high-pressure measurements of the 5-22 cm opacity and refractivity of water vapor broadened by hydrogen and helium under Jovian conditions will be presented.
This work was supported by NASA Contract NNM06AA75C from the Marshall Space Flight Center supporting the Juno Mission Science Team, under Subcontract 699054X from the Southwest Research Institute.
Hanley Thomas Ryan
Karpowicz Bryan M.
Steffes Paul Gregory
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