The electrical properties of Titan’s surface at the Huygens landing site measured with the PWA-HASI Mutual Impedance Probe. New approach and new findings - Archive ouverte HAL Access content directly
Journal Articles Icarus Year : 2016

The electrical properties of Titan’s surface at the Huygens landing site measured with the PWA-HASI Mutual Impedance Probe. New approach and new findings

(1) , (1) , (1) , (2) , (3) , (4) , (4) , (5) , (5) , (6) , (7) , (1)
1
2
3
4
5
6
7

Abstract

Ten years after the successful landing of the Huygens Probe on the surface of Titan, we reassess the derivation of ground complex permittivity using the PWA-MIP/HASI measurements (Permittivity, Waves and Altimetry-Mutual Impedance Probe/Huygens Atmospheric Structure Instrument) at the frequencies 45, 90 and 360 Hz. For this purpose, we have developed a numerical method, namely “the capacity-influence matrix method”, able to account for new insights on the Huygens probe attitude at its final resting position. We find that the surface of Titan at the landing site has a dielectric constant of 2.5±0.3 and a conductivity of 1.2±0.6 nS/m, in agreement with previously published results but with much more reliable error estimates. These values speak in favour of a photochemical origin of the material in the first meter of the subsurface. We also propose, for the first time, a plausible explanation for the sudden change observed by PWA-MIP ∼11 min after landing: this change corresponds to a drop in the ground conductivity, probably due to the removal of a superficial conductive layer in association with the release of volatile materials warmed by the Huygens Probe.
Fichier principal
Vignette du fichier
Hamelin_The_electrical.pdf (2.09 Mo) Télécharger le fichier
Origin : Files produced by the author(s)
Loading...

Dates and versions

insu-01244880 , version 1 (04-01-2016)

Identifiers

Cite

Michel Hamelin, Anthony Lethuillier, Alice Le Gall, Réjean Grard, Christian Béghin, et al.. The electrical properties of Titan’s surface at the Huygens landing site measured with the PWA-HASI Mutual Impedance Probe. New approach and new findings. Icarus, 2016, 270, pp.272-290. ⟨10.1016/j.icarus.2015.11.035⟩. ⟨insu-01244880⟩
350 View
308 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More