V. Hue

Contrasting C/O ratios in Uranus and Neptune from disequilibrium chemistry: A clue to distinct evolutionary pathways?

T. Briand, V. Hue, O. Mousis, T. Cavalié et autres

The formation of Uranus and Neptune remains poorly constrained, largely due to poorly known deep elemental abundances. Carbon monoxide (CO), a disequilibrium species in the upper troposphere, provides an indirect constraint on the deep oxygen abundance. We wish to improve our knowledge …

The origins of patchy aurora at Jupiter

Alec Daly, W. Li, Q. Ma, Xiaochen Shen et autres

Auroral emissions play a critical role in coupling the magnetosphere and atmosphere at magnetized planets. At Jupiter, isolated auroral patches equatorward of the main auroral oval have been associated with magnetospheric injections, yet the key conditions driving these emissions remain unclear. Here …

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Spatial variability of CH

J. Vinesse, B. Bonfond, B. Benmahi, A. Moirano et autres

Context. Ultraviolet (UV) auroral emissions on Jupiter offer a unique window into the coupling between the planet’s magnetosphere and upper atmosphere. Color ratios derived from molecular hydrogen emissions provide valuable diagnostics for the energy of precipitating electrons and the structure of the …

Juno’s high-spatial-resolution ultraviolet observations of Ganymede’s auroral patches

A. Moirano, P. Gusbin, B. Bonfond, D. Grodent et autres

Aims. We analyzed ultraviolet observations of Ganymede recorded on June 7, 2021, by the Juno spacecraft, which observed the aurora at high spatial resolution in order to detect the presence of auroral sub-structures. The emission mainly comes from two oxygen lines at …

The vertical profile of the northern Io footprint auroral emission in the far-ultraviolet from Juno

A. Moirano, B. Bonfond, G. Sicorello, J. Vinesse et autres

Context. The interaction between Io and the Jovian magnetosphere produces the auroral “Io footprint”, which can be observed in the ultraviolet thanks to the deexcitation of atmospheric H and H2 under electron precipitation. Since 2016, Jupiter has been explored with Juno’s Ultraviolet …

Characterising injection signatures in Jupiter’s ultraviolet aurora using Juno observations

L.A. Head, D. Grodent, B. Bonfond, A. Moirano et autres

Discrete features in Jupiter's ultraviolet aurora have been interpreted as signatures of plasma injections in the middle magnetosphere. There exists some ambiguity as to whether magnetodisc scattering or high-latitude Alfvénic acceleration best describes the observed properties of these injection signatures, and also …

Characterising injection signatures in Jupiter’s ultraviolet aurora using Juno observations

L.A. Head, D. Grodent, B. Bonfond, A. Moirano et autres

Discrete features in Jupiter’s ultraviolet aurora have been interpreted as signatures of plasma injections in the middle magnetosphere. There exists some ambiguity as to whether magnetodisc scattering or high-latitude Alfvénic acceleration best describes the observed properties of these injection signatures, and also …

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Juno’s high-spatial-resolution ultraviolet observations of Ganymede’s auroral patches

A. Moirano, P. Gusbin, B. Bonfond, D. Grodent et autres

Aims. We analyzed ultraviolet observations of Ganymede recorded on June 7, 2021, by the Juno spacecraft, which observed the aurora at high spatial resolution in order to detect the presence of auroral sub-structures. The emission mainly comes from two oxygen lines at …

be, it, de, us, hk, fr (code pays fourni par la source)

The vertical profile of the northern Io footprint auroral emission in the far-ultraviolet from Juno

A. Moirano, B. Bonfond, G. Sicorello, J. Vinesse et autres

Context . The interaction between Io and the Jovian magnetosphere produces the auroral “Io footprint”, which can be observed in the ultraviolet thanks to the deexcitation of atmospheric H and H 2 under electron precipitation. Since 2016, Jupiter has been explored with …

be, it, us, fr (code pays fourni par la source)

Precipitating electron properties of Ganymede’s aurora retrieved from Juno/UVS observations during PJ34

Bilal Benmahi, V. Hue, Benjamin Benne, Benoît Hubert et autres

Context . Ganymede’s UV aurorae, observed by HST and Juno/UVS, trace interactions between its atmosphere and Jupiter’s magneto-sphere. These emissions, dominated by O I lines at 130.4 and 135.6 nm, are driven by electron impact on species such as H 2 O, …

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First absolute wind measurements in Saturn’s stratosphere from ALMA observations (Corrigendum)

Bilal Benmahi, T. Cavalié, Thierry Fouchet, R. Moreno et autres

International audience

Auroral 3D structure retrieval from the Juno/UVS data

Bilal Benmahi, Bertrand Bonfond, Benjamin Benne, V. Hue et autres

Context. Jovian auroras, the most powerful in the Solar System, result from the interaction between the magnetosphere and atmosphere of Jupiter. While the horizontal morphology of these phenomena has been widely studied, their vertical structure, determined by the penetration depth of the …

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