Multiple-wavelength sensing of Jupiter during the Juno mission's first perijove passage
Orton, G.S. ; Momary, T. ; Ingersoll, A.P. ; et al. ; - ASI Sponsor
May - 2017
DOI: 10.1002/2017GL073019

journal : Geophysical Research Letters

Volume : 44 ; Issue : 10
type: Article Journal

We compare Jupiter observations made around 27 August 2016 by Juno's JunoCam, Jovian Infrared Auroral Mapper (JIRAM), MicroWave Radiometer (MWR) instruments, and NASA's Infrared Telescope Facility. Visibly dark regions are highly correlated with bright areas at 5 µm, a wavelength sensitive to gaseous NH3 gas and particulate opacity at p ≤5 bars. A general correlation between 5-µm and microwave radiances arises from a similar dependence on NH3 opacity. Significant exceptions are present and probably arise from additional particulate opacity at 5 µm. JIRAM spectroscopy and the MWR derive consistent 5-bar NH3 abundances that are within the lower bounds of Galileo measurement uncertainties. Vigorous upward vertical transport near the equator is likely responsible for high NH3 abundances and with enhanced abundances of some disequilibrium species used as indirect indicators of vertical motions.

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Notes : AcknowledgmentsThe development of JIRAM and the work of Italian coauthors were supported by the Italian Space Agency through ASI-INAF contract I/010/10/0 and 2014-050-R.0. J.