Geophysics; Geochemistry and Petrology; Earth and Planetary Sciences (miscellaneous); Space and Planetary Science; astro-ph.EP; Physics - Space Physics
Abstract :
[en] Reflected sunlight observations from the Ultraviolet Spectrograph (UVS) on the Juno spacecraft were used to study the distribution of acetylene (C2H2) at Jupiter's south pole. We find that the shape of the C2H2 absorption feature varies significantly across the polar region, and this can be used to infer spatial variability in the C2H2 abundance. There is a localized region of enhanced C2H2 absorption which coincides with the location of Jupiter's southern polar aurora; the C2H2 abundance poleward of the auroral oval is a factor of 3 higher than adjacent quiescent, non-auroral longitudes. This builds on previous infrared studies, which found enhanced C2H2 abundances within the northern auroral oval. This suggests that Jupiter's upper-atmosphere chemistry is being strongly influenced by the influx of charged auroral particles and demonstrates the necessity of developing ion-neutral photochemical models of Jupiter's polar regions.
Research Center/Unit :
STAR - Space sciences, Technologies and Astrophysics Research - ULiège
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Giles, Rohini S. ; Space Science and Engineering Division, Southwest Research Institute, San Antonio, United States
Hue, Vincent ; Space Science and Engineering Division, Southwest Research Institute, San Antonio, United States ; Aix-Marseille Université, CNRS, CNES, Institut Origines, LAM, Marseille, France
Greathouse, Thomas K. ; Space Science and Engineering Division, Southwest Research Institute, San Antonio, United States
Gladstone, G. Randall ; Space Science and Engineering Division, Southwest Research Institute, San Antonio, United States ; Department of Physics and Astronomy, University of Texas at San Antonio, San Antonio, United States
Kammer, Joshua A. ; Space Science and Engineering Division, Southwest Research Institute, San Antonio, United States
Versteeg, Maarten H. ; Space Science and Engineering Division, Southwest Research Institute, San Antonio, United States
Bonfond, Bertrand ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Grodent, Denis ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Gérard, Jean-Claude ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Sinclair, James A. ; Jet Propulsion Laboratory, Pasadena, United States
Bolton, Scott J. ; Space Science and Engineering Division, Southwest Research Institute, San Antonio, United States
Levin, Steven M. ; Jet Propulsion Laboratory, Pasadena, United States
Language :
English
Title :
Enhanced C2H2 Absorption Within Jupiter's Southern Auroral Oval From Juno UVS Observations
NASA - National Aeronautics and Space Administration F.R.S.-FNRS - Fonds de la Recherche Scientifique
Funding text :
The authors are grateful to the NASA and contributing institutions, which have made the Juno mission possible. This work was funded by the NASA's New Frontiers Program for Juno via contract with the Southwest Research Institute. BB is a Research Associate of the Fonds de la Recherche Scientifique – FNRS.The authors are grateful to the NASA and contributing institutions, which have made the Juno mission possible. This work was funded by the NASA's New Frontiers Program for Juno via contract with the Southwest Research Institute. BB is a Research Associate of the Fonds de la Recherche Scientifique – FNRS.
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