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Angular Dependence and Spatial Distribution of Jupiter's Centimeter‐Wave Thermal Emission From Juno's Microwave Radiometer
Earth and Space Science ( IF 2.312 ) Pub Date : 2020-10-14 , DOI: 10.1029/2020ea001254
Fabiano Oyafuso; Steven Levin; Glenn Orton; Shannon T. Brown; Virgil Adumitroaie; Michael Janssen; Michael H. Wong; Leigh N. Fletcher; Paul Steffes; Cheng Li; Samuel Gulkis; Sushil Atreya; Sidharth Misra; Scott Bolton

NASA's Juno spacecraft has been monitoring Jupiter in 53‐day orbits since 2016. Its six‐frequency microwave radiometer (MWR) is designed to measure black body emission from Jupiter over a range of pressures from a few tenths of a bar to several kilobars in order to retrieve details of the planet's atmospheric composition, in particular, its ammonia and water abundances. A key step toward achieving this goal is the determination of the latitudinal dependence of the nadir brightness temperature and limb darkening of Jupiter's thermal emission through a deconvolution of the measured antenna temperatures. We present a formulation of the deconvolution as an optimal estimation problem. It is demonstrated that a quadratic expression is sufficient to model the angular dependence of the thermal emission for the data set used to perform the deconvolution. Validation of the model and results from a subset of orbits favorable for MWR measurements is presented over a range of latitudes that cover up to 60° from the equator. A heuristic algorithm to mitigate the effects of nonthermal emission is also described.
更新日期:2020-11-21
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