Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.1918s&link_type=abstract
American Astronomical Society, DPS meeting #39, #19.18; Bulletin of the American Astronomical Society, Vol. 39, p.447
Astronomy and Astrophysics
Astronomy
Scientific paper
In recent years, an improved laboratory measurement system was developed at Georgia Tech to measure ammonia and water vapor opacity 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. This system has provided high-precision measurements over a range of temperature and pressure conditions which correspond to altitudes probed by spacecraft radio occultation experiments (e.g. Cassini), by entry probe signal extinction measurements (e.g. Galileo), and by passive radio emission measurements from both spacecraft (e.g. Juno) and earth-based radio telescopes. 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 ammonia and water vapor 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 ammonia or water vapor at such high pressures, and none of these measurements were conducted at wavelengths greater than 3.3 cm.
The system being developed will enable the measurement of ammonia and water vapor 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.
This work is supported by NASA under Subcontract 699054X from SwRI supporting the Juno Mission Science Team.
Hanley Thomas Ryan
Karpowicz Bryan M.
Steffes Paul Gregory
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