A5079254011- Astro and Planetary Science
- Planetary Science and Exploration
- Space Exploration and Technology
- Atmospheric Ozone and Climate
- Solar and Space Plasma Dynamics
- Stellar, planetary, and galactic studies
- Isotope Analysis in Ecology
- Astrophysics and Star Formation Studies
- Geology and Paleoclimatology Research
- Ionosphere and magnetosphere dynamics
- Spectroscopy and Laser Applications
- Methane Hydrates and Related Phenomena
- Geomagnetism and Paleomagnetism Studies
- Astronomy and Astrophysical Research
- Laser-induced spectroscopy and plasma
- Spacecraft Design and Technology
University of Liège
2023-2024
Université de Bordeaux
2020-2024
Centre National de la Recherche Scientifique
2020-2024
Laboratoire d'Astrophysique de Bordeaux
2019-2023
Verein zur Förderung Agrar- und Stadtökologischer Projekte
2022
Context. The tropospheric wind pattern in Jupiter consists of alternating prograde and retrograde zonal jets with typical velocities up to 100 m/s around the equator. At much higher altitudes, ionosphere, strong auroral have been discovered 1-2 km/s. There is no such direct measurement stratosphere planet. Aims. In this paper, we bridge altitude gap between these measurements by directly measuring speeds Jupiter's stratosphere. Methods. We use Atacama Large Millimeter/submillimeter Array's...
Context . Juno, which studies the Jovian system, continues to expand our knowledge of Jupiter’s magnetosphere and its environment. Thanks onboard instruments such as Jupiter Energetic Particle Detector Instrument (JEDI) Auroral Distributions Experiment (JADE), in situ measurements have allowed us derive a realistic representation charged particle energy distributions precipitating auroral regions. Because distance between Juno’s measurement location position impact particles, where emissions...
Abstract We present radiative transfer analyses of IRTF-TEXES and SOFIA-EXES mid-infrared spectra Jupiter's mid- to high latitudes recorded between 2019 April 16 2023 July 20. The were inverted across a photochemical model grid varying eddy diffusion coefficient profiles, the quality fit synthetic observed was used constrain CH 4 homopause level. For subset latitudes/dates, we find that level is elevated in region enclosed inside of, or magnetospherically poleward northern ultraviolet main...
At Jupiter, the fast planetary rotation, strong magnetic field and presence of a relatively high density plasma create powerful electromagnetic environment. Jupiter’s auroras are one evidence magnetospheric activity around planet. The interaction between four major moons Jupiter - Io, Europa, Ganymede Callisto Jovian magnetosphere produces satellite-induced auroral emissions, called footprints. These caused by flow past moons, which triggers local perturbation that generates mainly...
Jovian auroras, the most intense in Solar System, arise from interactions between Jupiter’s magnetosphere and atmosphere. While their horizontal morphology has been extensively studied, vertical structure, shaped by penetration depth of magnetospheric electrons, remains less well understood. Previous observations, including those Hubble Space Telescope (HST), have provided only partial insights into this aspect. This study aims to characterize structure auroral emissions.We...
Starting from the Jupiter approach phase in early 2016, several Hubble Space Telescope observation campaigns dedicated to UV aurorae have been executed order support Juno mission. For example, these images used study auroral response solar wind shocks measured by Juno's situ instruments, or identify specific morphologies associated with a compressed magnetosphere. In this presentation, we will focus on acquired simultaneously spectrograph one hand and Imaging Spectrograph other hand, each...
The impact of the Shoemaker-Levy 9 (SL9) comet on Jupiter in 1994 opened up a new field study focused exogenic species within Jupiter's atmosphere. Among these species, we find H_2O, CO, and HCN. It is thought that coexist at same pressure level (∼ 3 mbar 2022) interaction between some them creates daughter molecules such as CO_2.However, understanding their complex meridional distributions still matter debate. We measured distribution HCN, CO_2 to understand chemistry dynamics leading...
Context. Past observations of Saturn with ground-based and space telescopes have enabled the monitoring tropospheric wind speeds using cloud-tracking techniques. The most remarkable feature is a broad fast prograde jet at equator that reaches ~400 m s −1 . Saturn’s stratospheric dynamics are less well-known. At low latitudes, they characterized by thermal signature an equatorial oscillation; observed structure implies there strong oscillating vertical shear zonal winds throughout...
Since the 1950s, quasi-periodic oscillations have been studied in terrestrial equatorial stratosphere. Other planets of solar system present (or are expected to present) such oscillations, like Jupiter Equatorial Oscillation(JEO) and Saturn Semi-Annual Oscillation (SSAO). In Jupiter's stratosphere, oscillation its relative temperature structure about equator, is characterized by a quasi-period 4.4 years. The stratospheric wind field zone has never directly observed. this paper, we aim at...
Jovian auroras, the most powerful in Solar System, result from interaction between magnetosphere and atmosphere of Jupiter. While horizontal morphology these phenomena has been widely studied, their vertical structure, determined by penetration depth magnetospheric electron into auroral regions, remains relatively unexplored. Previous observations, including those Hubble Space Telescope (HST), have addressed this question to a limited extent. In study we aim map structure emissions. Using...
Comet Shoemaker-Levy 9 impacted Jupiter in July 1994, leaving its stratosphere with several new species, among them water vapor (H2O). With the aid of a photochemical model H2O can be used as dynamical tracer jovian stratosphere. In this paper, we aim at constraining vertical eddy diffusion (Kzz) levels where resides. We monitored disk-averaged emission 556.936 GHz Odin space telescope between 2002 and 2019, covering nearly two decades. analyzed data combination 1D radiative transfer models...
Context. Due to its inclined orbit and the complex geometry of magnetic field Neptune, Triton experiences a highly variable environment. As precipitation magnetospheric electrons is thought have large impact on atmosphere, better understanding interaction between atmosphere magnetosphere Neptune important. Aims. We aim couple model with an electron transport compute varying atmospheric composition. Methods. coupled recent photochemical TRANSPlanets. The inputs this code were determined from...
Auroral emissions are a reflection of magnetospheric processes, and, at Jupiter, it is not entirely certain how the morphology UV main emission (ME) varies with compression or strength central current sheet. This work leverages observations from Juno-UVS to link ME variability states. Novel arc-detection techniques used determine new reference ovals for perijoves 1 through 54, in both hemispheres, and analyse size shape vary compared this oval. The brightness local time: dawn-side typically...
Auroral emissions are a reflection of magnetospheric processes, and at Jupiter, it is not entirely certain how the morphology UV main emission (ME) varies with compression or strength central current sheet. This work leverages observations from Juno-UVS to link ME variability particular states. We employed novel arc-detection techniques determine new reference ovals for perijoves 1 through 54, in both hemispheres, analysed size shape vary compared this oval. The brightness local time:...
Jupiter's polar stratosphere exhibits unique chemical and dynamical processes that shape its atmospheric composition structure. This paper reviews observational constraints modeling efforts aimed at understanding the complex interplay between chemistry, dynamics, aerosol microphysics in high-latitude regions.Hydrocarbon observations from various instruments (e.g. Voyager/IRIS, Cassini/CIRS, IRTF/TEXES, Juno/UVS, JWST/MIRI) have revealed significant abundance enhancements latitudinal...
At Jupiter, the fast planetary rotation, strong magnetic field and presence of a relatively high density charged particles create powerful electromagnetic environment. The four major moons Jupiter (Io, Europa, Ganymede Callisto, also called “Galilean moons”) all orbit within Jovian magnetosphere, auroral emissions associated with their orbital motion can be observed (Figure 1). These are caused by flow Io Plasma Torus plasma disk past moons, which triggers local...
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IntroductionDuring the only flyby of Triton by Voyager 2 in 1989, a dense ionosphere was observed (Tyler et al. 1989). Results were surprising as solar irradiation this satellite is ten times lower than on Titan, and yet its denser. Thus, electronic precipitation from Neptune’s magnetosphere hypothesized to bring needed extra input energy (Krasnopolsky 1993), high electrons have been spacecraft area (Krimigis 1989).  To understand how could impact composition...