Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.2216l&link_type=abstract
American Astronomical Society, DPS meeting #28, #22.16; Bulletin of the American Astronomical Society, Vol. 28, p.1144
Astronomy and Astrophysics
Astronomy
Scientific paper
The Galileo probe Net Flux Radiometer measured up and net fluxes in solar and thermal bandpasses. When corrected for non-radiative perturbations as defined by Sromovsky et al. (Science 272, 851-854, 1996), the net flux in the long wave solar channel goes to zero near 5 bars, while radiation in the broad band channel penetrates to 10 bars. Using a similar, preliminary correction to the up flux, the up and net fluxes can be combined into up and down fluxes as a function of depth in Jupiter's atmosphere. These can be inverted to yield atmospheric opacity. First, known opacity sources and the spatial and spectral sensitivities of the NFR are accounted for. Second, the fluxes are used to determine the reflection and transmission properties of the layer. Third, scattering and absorbing opacity is added to an atmospheric model to match these properties. This step is iterated until all of the sampled properties of the atmosphere are fit. The long wave channel is inverted first, then the short wave channel (holding the long wave opacity fixed). Results show higher opacity at longer wavelengths in the 2- to 5-bar region. The accuracy of the inversion process is limited by uncertainties in the up flux profile, which has fewer samples as well as more poorly constrained perturbation corrections compared to the net flux profiles. Attempts to use LRD total solar flux measurements (Lanzerotti et al., Science 272, 858-60, 1996) to derive improved up flux constraints have not yet been very fruitful because of apparent incompatibilities between the two data sets. Models will be used to estimate the daily average penetration of sunlight and uncertainties associated with NFR thermal perturbation corrections. This research was supported by the Galileo Project through a grant from the Ames Research Center.
Collard Andrew
Lemmon Mark Thomas
Sromovsky Larry
Tomasko Martin G.
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