Enhanced C 2 H 2 Absorption Within Jupiter's Southern Auroral Oval From Juno UVS Observations - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Geophysical Research. Planets Année : 2023

Enhanced C 2 H 2 Absorption Within Jupiter's Southern Auroral Oval From Juno UVS Observations

Rohini Giles
Vincent Hue
Thomas Greathouse
Joshua Kammer
Jean‐claude Gérard
James Sinclair
Steven Levin

Résumé

Abstract Reflected sunlight observations from the Ultraviolet Spectrograph (UVS) on the Juno spacecraft were used to study the distribution of acetylene (C 2 H 2 ) at Jupiter's south pole. We find that the shape of the C 2 H 2 absorption feature varies significantly across the polar region, and this can be used to infer spatial variability in the C 2 H 2 abundance. There is a localized region of enhanced C 2 H 2 absorption which coincides with the location of Jupiter's southern polar aurora; the C 2 H 2 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 C 2 H 2 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.
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hal-04505857 , version 1 (24-03-2024)

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Rohini Giles, Vincent Hue, Thomas Greathouse, G. Randall Gladstone, Joshua Kammer, et al.. Enhanced C 2 H 2 Absorption Within Jupiter's Southern Auroral Oval From Juno UVS Observations. Journal of Geophysical Research. Planets, 2023, 128 (2), ⟨10.1029/2022JE007610⟩. ⟨hal-04505857⟩
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