Alice Le Gall
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Performance validation of WISDOM, the GPR of the ExoMars 2028 mission, on a Martian analogue dataset acquired in Svalbard Open
IntroductionThe investigation of the subsurface of Mars provides key insights into its geological history and reveal signs of extinct life. This is why the ExoMars/Rosalind Franklin rover mission has been designed to search for biosignatur…
View article: Measuring Schumann Resonances on Titan: expected performances of future EFIELD/Dragonfly observations
Measuring Schumann Resonances on Titan: expected performances of future EFIELD/Dragonfly observations Open
I. IntroductionMany evidence suggest the presence of an internal global ocean on Titan [1,2]. Notably, the Permittivity, Wave and Altimetry (PWA) analyzer on board the Huygens’ probe in 2005 might have detected a Schumann-like resonance (S…
View article: Investigating Iapetus' dichotomy with multi-wavelength microwave observations
Investigating Iapetus' dichotomy with multi-wavelength microwave observations Open
Indubitably, the most dramatic albedo hemispheric dichotomy in the Solar system occurs at Iapetus. Its leading (L) side is covered by an optically low-albedo material, contrasting with its bright trailing (T) side. This dichotomy is also v…
Investigating the use of Circular Polarization Ratio for water ice detection by polarimetric Ground Penetrating Radars operating from the surface Open
Over the last 15 years, Ground Penetrating Radars have been successfully used to locally characterize the subsurface of the Moon and Mars, on board rovers. Most of these GPR operate in a single polarization but future ones, and in particul…
View article: Enceladus’ SPT surface and subsurface properties as constrained by Cassini RADAR observations
Enceladus’ SPT surface and subsurface properties as constrained by Cassini RADAR observations Open
Introduction and AbstractThe RADAR onboard Cassini probe (2004-2017), operating in active and passive (or radiometry) mode at 2.2-cm wavelength recorded the backscatter from the surface (through normalized radar backscatter cross section σ…
View article: Titan Acoustics: Assessing the detectability of natural sound sources with the Dragonfly microphones
Titan Acoustics: Assessing the detectability of natural sound sources with the Dragonfly microphones Open
The connection between Titan's atmosphere and its surface is unique: it is at the origin of a variety of surface processes, in particular of surface-atmosphere interactions – liquid methane flows, waves, rainfall, dune movements, saltation…
View article: Active-passive microwave scattering in the Antarctica wind-glazed region: an analog for icy moons of Saturn
Active-passive microwave scattering in the Antarctica wind-glazed region: an analog for icy moons of Saturn Open
Microwave radiometry and scatterometry, two complimentary modes of sensing the composition and structure of the top meters to hundreds of meters of the subsurface, are often difficult to reconcile, both on the Earth cryosphere and on icy m…
Schumann Resonances as a tool to constrain the depth of Titan's buried water ocean: Re-assessment of Huygens observations and preparation of the EFIELD/Dragonfly experiment Open
Among the lines of evidence for a buried ocean on Titan is the possible detection, in 2005, by the Permittivity, Wave and Altimetry (PWA) analyzer on board the ESA Huygens probe of Schumann-like Resonances (SR). SR are Extremely Low Freque…
View article: Understanding the Composition of Titan’s Surface from Remote Sensing Data
Understanding the Composition of Titan’s Surface from Remote Sensing Data Open
International audience
Insigths into scattering and thermal anomalies at Enceladus’ SPT from the active and passive Cassini radar observations. Open
Introduction and MotivationThe Cassini probe (2004-2017) had onboard a RADAR operating both in an active and passive (or radiometry) mode at 2.2-cm wavelength. In its active mode, the RADAR recorded the backscatter from the surface (throug…
Measuring Schumann Resonances on Titan: Constraints on the internal ocean from PWA/Huygens and future EFIELD/Dragonfly observations Open
I.IntroductionSeveral lines of evidence suggest the presence of an internal global ocean on Titan [1, 2]. Among them, is the detection of a Schumann-like resonance (SR) by the Permittivity, Wave and Altimetry (PWA) analyzer on board the Hu…
PyBWE: Open-Source Python tools for Super-Resolution applied to Planetary Radar Soundings Open
Range resolution is one of the key performance metrics for a radar instrument. It is driven by the time resolution of its soundings, and the electromagnetic properties of the sounded material. This resolution is set by design, as it is lim…
Spectral analysis of radargrams of the Martian subsurface to constrain scatterer sizes-Application to RoSPR/Zhurong and RIMFAX/Perseverance GPR data Open
Introduction :In planetary sciences, accessing the subsurface is essential to fully understand the geological history of a given site. GPR (Ground Penetrating Radar) offers a way to investigate the subsurface in a non-destructive manner. S…
Iapetus: Investigating the most dramatic hemispheric dichotomy in the Solar system with radio observations Open
Introduction Saturn’s icy satellites, in synchronous rotation around Saturn, often display large differences between their leading (L) and trailing (T) sides, which interact differently with their orbital environment and, in particular, wi…
Tagging Titan's Terrains as Potential Sediment Deposits from the joint analysis of Cassini Active and Passive RADAR Observations Open
Context and motivationUnder its thick atmosphere, Titan hosts a unique variety of geomorphological features [1] including indications of evidence of fluvial and/or pluvial activity [2,3,4]. Rivers, canyons, and alluvial fans have been mapp…
Analysis of the Martian subsurface from the observation of the Rover Subsurface Penetrating Radar (RoSPR) onboard Tianwen- Open
IntroductionChina’s first Mars exploration mission, Tianwen-1, was successfully launched on 23rd July 2020. The mission included an orbiter, a lander, and the Zhurong rover. Zhurong landed on Mars in the southern part of Utopia Planitia (1…
The WISDOM GPR on board the ESA’s ExoMars Rosalind Franklin Rover – Focus on tools developed for a quantitative data interpretation Open
IntroductionThe ExoMars Rosalind Franklin Rover exobiology mission is now scheduled to launch in 2028 to search for traces of past or present life in the shallow subsurface of Oxia Planum [1],[2]. The Rover is equipped with a drill capable…
View article: The high-resolution map of Oxia Planum, Mars; the landing site of the ExoMars Rosalind Franklin rover mission
The high-resolution map of Oxia Planum, Mars; the landing site of the ExoMars Rosalind Franklin rover mission Open
This 1:30,000 scale geological map describes Oxia Planum, Mars, the landing site for the ExoMars Rosalind Franklin rover mission. The map represents our current understanding of bedrock units and their relationships prior to Rosalind Frank…
View article: Titan’s surface chemical composition: what we learnt after 13 years of Cassini exploration
Titan’s surface chemical composition: what we learnt after 13 years of Cassini exploration Open
The Cassini spacecraft spent 13 years in the Saturnian system and performed observations of Titan through 127 flybys, along with the in situ observations of the surface by Huygens. This led to the detailed investigation of Titan’s surface …
Taking Titan’s Boreal Pole Temperature: Evidence for Evaporative Cooling in Ligeia Mare Open
From 2004 to 2017, the Cassini RADAR recorded the 2.2 cm thermal emission from Titan’s surface in its passive (radiometry) mode of operation. We use this data set to investigate the seasonal evolution of the effective temperature sensed by…
Microwave spectra of the leading and trailing hemispheres of Iapetus Open
The leading hemisphere of Saturn’s synchronous moon Iapetus is covered by a low-albedo material, contrasting with its bright trailing hemisphere. This dichotomy is also apparent in radar and microwave radiometry observations, which are sen…
The impact of lake shape and size on lake breezes and air-lake exchanges on Titan Open
Titan, the largest moon of Saturn, has many lakes on its surface, formed mainly of liquid methane. Like water lakes on Earth, these methane lakes on Titan likely profoundly affect the local climate. Previous studies (Rafkin and Soto 2020, …
Dataset for "The impact of lake shape and size on lake breezes and air-lake exchanges on Titan" Open
Code and data presented in the paper "The impact of lake shape and size on lake breezes and air-lake exchanges on Titan", published in Icarus in 2024 (https://doi.org/10.1016/j.icarus.2023.115925). Are made available: -the Fortran source c…
Dataset for "The impact of lake shape and size on lake breezes and air-lake exchanges on Titan" Open
Code and data presented in the paper "The impact of lake shape and size on lake breezes and air-lake exchanges on Titan", published in Icarus in 2024 (https://doi.org/10.1016/j.icarus.2023.115925). Are made available: -the Fortran source c…
View article: Updated Radiative Transfer Model for Titan in the Near-infrared Wavelength Range: Validation against Huygens Atmospheric and Surface Measurements and Application to the Cassini/VIMS Observations of the Dragonfly Landing Area
Updated Radiative Transfer Model for Titan in the Near-infrared Wavelength Range: Validation against Huygens Atmospheric and Surface Measurements and Application to the Cassini/VIMS Observations of the Dragonfly Landing Area Open
We present an analysis of Titan data acquired by the Cassini Visual and Infrared Mapping Spectrometer (VIMS) at the landing site of the Dragonfly mission, using a new version of our radiative transfer model for Titan, with significant upda…