Denis Grodent
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View article: Precipitating electron properties of Ganymede’s aurora retrieved from Juno/UVS observations during PJ34
Precipitating electron properties of Ganymede’s aurora retrieved from Juno/UVS observations during PJ34 Open
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 …
View article: The Pedersen and Hall conductances in the Jovian polar regions: New maps based on a broadband electron energy distribution
The Pedersen and Hall conductances in the Jovian polar regions: New maps based on a broadband electron energy distribution Open
Context . The ionospheric Pedersen and Hall conductances play an important role in understanding the coupling by which angular momentum, energy, and matter are exchanged between the magnetosphere, ionosphere and thermosphere at Jupiter, mo…
View article: Spatial variability of CH4 and C2H2 absorptions in Jupiter's auroral regions from Juno-UVS observations
Spatial variability of CH4 and C2H2 absorptions in Jupiter's auroral regions from Juno-UVS observations Open
Color ratios derived from molecular hydrogen emissions provide valuable diagnostics for the energy of precipitating electrons and the structure of the auroral atmosphere. We aim to characterize the horizontal and vertical variability of hy…
View article: Rotating Finger‐Like Structures of Jovian Magnetodisc
Rotating Finger‐Like Structures of Jovian Magnetodisc Open
At Jupiter, the plasma is concentrated near the centrifugal equator, forming a magnetodisc. The planet's dipole tilt induces periodic disc flapping, generating magnetic oscillations observed by spacecraft. While centrifugal forces are theo…
View article: The Pedersen and Hall Conductances in the Jovian Polar Regions: New Maps based on a Broadband Electron Energy Distribution
The Pedersen and Hall Conductances in the Jovian Polar Regions: New Maps based on a Broadband Electron Energy Distribution Open
The ionospheric Pedersen and Hall conductances play an important role in understanding the exchanges of angular momentum, energy and matter between the magnetosphere and the ionosphere/thermosphere at Jupiter, modifying the composition and…
View article: A bright path under Juno's footprint
A bright path under Juno's footprint Open
Juno's UltraViolet Spectrograph captures spectrally resolved images of Jupiter's aurorae by scanning a narrow swath across the planet for every rotation of the spacecraft. A mirror at the entrance of the instrument allows us to aim for spe…
View article: Characterizing Auroral Acceleration Mechanisms at Jupiter: Statistical Analyses of Juno-UVS-Derived Electron Energies.
Characterizing Auroral Acceleration Mechanisms at Jupiter: Statistical Analyses of Juno-UVS-Derived Electron Energies. Open
Resulting from the precipitation of magnetospheric particles into the upper atmosphere, planetary aurorae form an image of the dynamics of the magnetosphere and its coupling with the ionosphere and atmosphere. Hence, exploring the upper at…
View article: Jupiter's ultraviolet auroral bridge: the influence of the solar wind on polar auroral morphology
Jupiter's ultraviolet auroral bridge: the influence of the solar wind on polar auroral morphology Open
Introduction. Jupiter's ultraviolet aurora frequently shows a number of arcs between the dusk-side polar region and the main emission, which are denoted as “bridges” (Figure 1, left). Thus far, the only dedicated study of the auroral bridg…
View article: The moon-induced auroral emissions at Jupiter: a natural probe of the atmosphere and magnetosphere
The moon-induced auroral emissions at Jupiter: a natural probe of the atmosphere and magnetosphere Open
The interaction between the four major moons of Jupiter - Io, Europa, Ganymede and Callisto - and the Jovian magnetic field generates satellite-induced auroral emissions, called footprints. These are caused by electrons precipitating into …
View article: The length of the Io footprint: Spectral characterization using Juno-UVS
The length of the Io footprint: Spectral characterization using Juno-UVS Open
The vast Jovian magnetosphere is filled with plasma originating from Io's volcanic activity in the inner magnetosphere. This plasma is structured as a sheet in near-corotation with Jupiter's magnetic field and confined to the centrifugal e…
View article: Characterizing Precipitating Electrons in Ganymede’s Auroras through Juno/UVS observations and Coupled Electron Transport and Radiative Transfer Models
Characterizing Precipitating Electrons in Ganymede’s Auroras through Juno/UVS observations and Coupled Electron Transport and Radiative Transfer Models Open
Auroral emissions provide key insights into interactions between planetary magnetic fields, atmospheres, and surrounding plasma. While Jupiter’s aurorae are well-studied, those of Ganymede, the only moon with an intrinsic magnetic field in…
View article: HST Lyman-α observations of Europa from 1999 to 2020: Constraints on the H exosphere
HST Lyman-α observations of Europa from 1999 to 2020: Constraints on the H exosphere Open
Jupiter moon Europa possesses a tenuous atmosphere, constantly replenished from weathering of the icy surface (McGrath et al. 2009, Johnson et al. 2009). The atmosphere is likely dominated by molecular oxygen (O2) near the surface and hydr…
View article: Jupiter's UV Auroral Response to a Magnetospheric Compression Event
Jupiter's UV Auroral Response to a Magnetospheric Compression Event Open
The highly elliptical polar orbit of the Juno mission provides a unique opportunity to simultaneously measure the compression state of Jupiter's magnetosphere and the total power emitted by the planet's ultraviolet aurora, using a single s…
View article: Jupiter's UV auroral response to a magnetospheric compression event
Jupiter's UV auroral response to a magnetospheric compression event Open
The highly elliptical polar orbit of the Juno mission provides a unique opportunity to simultaneously measure the compression state of Jupiter's magnetosphere and the total power emitted by the planet's ultraviolet aurora, using a single s…
View article: The moon-induced auroral emissions at Jupiter:a natural probe of the atmosphere and magnetosphere
The moon-induced auroral emissions at Jupiter:a natural probe of the atmosphere and magnetosphere Open
At Jupiter, the fast planetary rotation, the strong magnetic field and the presence of a relatively high density plasma create a powerful electromagnetic environment. Jupiter’s auroras are one evidence of the strong magnetospheric ac…
View article: A view from the other side: complementary observations of the Jovian UV aurorae from Hubble and Juno
A view from the other side: complementary observations of the Jovian UV aurorae from Hubble and Juno Open
Starting from the Jupiter approach phase in early 2016, several Hubble Space Telescope observation campaigns dedicated to the UV aurorae have been executed in order to support the Juno mission. For example, these images have been used to s…
View article: Reconstruction of the 3D Auroral Structure Using Juno/UVS Observations
Reconstruction of the 3D Auroral Structure Using Juno/UVS Observations Open
Jovian auroras, the most intense in the Solar System, arise from interactions between Jupiter’s magnetosphere and atmosphere. While their horizontal morphology has been extensively studied, their vertical structure, shaped by the pen…
View article: Auroral 3D structure retrieval from the Juno/UVS data
Auroral 3D structure retrieval from the Juno/UVS data Open
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 str…
View article: Moon-induced infrared and ultraviolet auroral emission at Jupiter: overview during the Juno mission
Moon-induced infrared and ultraviolet auroral emission at Jupiter: overview during the Juno mission Open
At Jupiter, the fast planetary rotation, the strong magnetic field and the presence of a relatively high density of charged particles create a powerful electromagnetic environment. The four major moons of Jupiter (Io, Europa, Ganymede and …
View article: The Polar Stratosphere of Jupiter
The Polar Stratosphere of Jupiter Open
Jupiter's polar stratosphere exhibits unique chemical and dynamical processes that shape its atmospheric composition and structure. This paper reviews observational constraints and modeling efforts aimed at understanding the complex interp…
View article: Dayside Magnetodisk Reconnection in Jovian System: Galileo and Voyager Observation
Dayside Magnetodisk Reconnection in Jovian System: Galileo and Voyager Observation Open
Magnetic reconnection, an essential mechanism in plasma physics that changes magnetic topology and energizes charged particles, plays a vital role in the dynamic processes of the Jovian magnetosphere. The traditional Vasyliūnas cycle only …
View article: Effect of magnetospheric conditions on the morphology of Jupiter’s ultraviolet main auroral emission as observed by Juno-UVS
Effect of magnetospheric conditions on the morphology of Jupiter’s ultraviolet main auroral emission as observed by Juno-UVS Open
Auroral emissions are a reflection of magnetospheric processes, and at Jupiter, it is not entirely certain how the morphology of the UV main emission (ME) varies with magnetospheric compression or the strength of the central current sheet.…
View article: Revealing the Local Time Structure of the Alfvén Radius in Jupiter's Magnetosphere Through High‐Resolution Simulations
Revealing the Local Time Structure of the Alfvén Radius in Jupiter's Magnetosphere Through High‐Resolution Simulations Open
In the context of planetary magnetospheres, the Alfvén radius plays a critical role as the demarcation line where the planet's magnetosphere and ionosphere effectively decouple. This boundary is pivotal in understanding the complex interac…
View article: Effect of magnetospheric conditions on the morphology of Jupiter's UV main auroral emission, as observed by Juno-UVS
Effect of magnetospheric conditions on the morphology of Jupiter's UV main auroral emission, as observed by Juno-UVS Open
Auroral emissions are a reflection of magnetospheric processes, and, at Jupiter, it is not entirely certain how the morphology of the UV main emission (ME) varies with magnetospheric compression or the strength of the central current sheet…
View article: On the Global Features of the 10–60‐Min ULF Waves in Jovian Magnetosphere: Juno Observations
On the Global Features of the 10–60‐Min ULF Waves in Jovian Magnetosphere: Juno Observations Open
In the Jovian magnetosphere, quasi‐periodic phenomena, with quasi‐periods on the order of 10–60 min, are frequently identified using different data sets. These pulsations are a branch of ultra‐low frequency (ULF) waves, which are believed …