Radar Backscatter: Insights into Composition, Roughness, and Topography at the Dragonfly Landing Site on Titan - INSU - Institut national des sciences de l'Univers Accéder directement au contenu
Communication Dans Un Congrès Année : 2022

Radar Backscatter: Insights into Composition, Roughness, and Topography at the Dragonfly Landing Site on Titan

Résumé

The Selk crater region on Titan, where the Dragonfly mission is planned to land in 2034, has been imaged by the Cassini Radar at incidence angles from 5° to 72°. Comparing the variations in normalized backscatter cross section σ0 as a function of incidence angle to those predicted by scattering models provides new insight into surface structural and compositional properties. We find that the most radar-dark regions including dunes are consistent with smooth, uniform material with low dielectric constants compatible with organic sand, whereas the crater rim is likely composed of a rough, fractured, low-loss material like water ice. Applying a single-scattering diffuse model to high-incidence data at different polarizations enabled independent derivation of the dielectric constant, whose low (<2) values indicate a depolarizing (sub)surface. Finally, we used the backscatter models to apply radarclinometry over the Selk crater rim revealing lateral variations in rim height, which remains below 300 m along the SARTopo profile but reaches up to 600 m at other locations.
Fichier non déposé

Dates et versions

insu-04485656 , version 1 (01-03-2024)

Identifiants

Citer

Léa Bonnefoy, Alexander Hayes, Antoine Lucas, Sebastien Rodriguez, Valerio Poggiali, et al.. Radar Backscatter: Insights into Composition, Roughness, and Topography at the Dragonfly Landing Site on Titan. AGU Fall Meeting 2022, Dec 2022, Chicago, United States. pp.id. P33E-01. ⟨insu-04485656⟩
6 Consultations
0 Téléchargements

Partager

Gmail Facebook X LinkedIn More