Other
Scientific paper
Sep 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.2103b&link_type=abstract
American Astronomical Society, DPS meeting #28, #21.03; Bulletin of the American Astronomical Society, Vol. 28, p.1134
Other
Scientific paper
The Galileo Net Flux Radiometer (NFR) measured vertical profiles of upward and net radiation fluxes in Jupiter's atmosphere beginning at 450 mb and extending to about 13 bars. Fluxes in two solar and three thermal spectral bands were separately measured to isolate the relative influences of particulates and gaseous absorbers on the radiative energy exchanges. All of these channels responded to both the desired radiation inputs and also to an undesired non-radiative thermal perturbation. The perturbation was measured by a sixth radiatively blind channel for use in correcting the other channels. However, the correction has been complicated by the fact that the perturbations clearly did not have the same amplitude in every channel. Preliminary results (Sromovsky et al., Science, pp. 851-854, 1996) are based on subtracting from each detector signal a channel-dependent, but time-independent, fraction of the blind channel signal. These fractions were rather well determined for net flux measurements by requiring the corrected flux profiles to satisfy simple physical constraints, some of which are guided by radiation transfer model calculations. Because of fewer samples and larger noise levels, the same approach did not lead to very tight constraints on the upflux measurements. To further assess the validity of this correction procedure we examine internal consistency, the results of on-board calibration measurements, pre-launch instrument wind-tunnel tests, and thermal model simulations of detector responses to plausible perturbation mechanisms. A second correction, for a temperature dependent responsivity, is also a current source of uncertainty, mainly between 13 and 16 bars, because detector temperatures prematurely exceeded the range explored by pre-launch calibration measurements. New spare instrument tests can better define both the perturbation and responsivity uncertainties affecting the NFR results. This research was supported by grant NAG2-1028 from the NASA Ames Research Center.
Best Fred A.
Collard A. D.
Fry Patrick M.
Revercomb Henry E.
Sromovsky Lawrence A.
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