HR: 1340h
AN: P23B-1359    [Abstracts]
TI: PWA-HASI Measurements of Titan Surface Permittivity at Huygens Landing Point
AU: * Hamelin, M
EM: michel.hamelin@cetp.ipsl.fr
AF: Centre d'etude des Environments Terrestre et Planétaires (CETP), 4, av de Neptune, Saint Maur, 94107, France
AU: Simoes, F
EM: fernando.simoes@cetp.ipsl.fr
AF: Centre d'etude des Environments Terrestre et Planétaires (CETP), 4, av de Neptune, Saint Maur, 94107, France
AU: Béghin, C
EM: cbeghin@cnrs-orleans.fr
AF: Laboratoire de Physique et Chimie de l'Environnement (LPCE), 3A av. Recherche, Orleans, 45100, France
AU: Lopez-Moreno, J J
EM: lopez@iaa.es
AF: Instituto de Astrofisica de Andalucia (IAA), PO Box 3004, Granada, 18080, Spain
AU: Grard, R
EM: rgrard@rssd.esa.int
AF: Research and Scientific Support Department (RSSD), ESA/ESTEC, Keplerlaan, Noordwijk, 2200 AG, Netherlands
AU: Schwingenschuh, K
EM: konrad.schwingenschuh@oeaw.ac.at
AF: Space Research Institute, Austrian Academy of Sciences (IWF), Infeldgasse, Graz, 8010, Austria
AU: Trautner, R
EM: roland.trautner@esa.int
AF: Research and Scientific Support Department (RSSD), ESA/ESTEC, Keplerlaan, Noordwijk, 2200 AG, Netherlands
AU: Falkner, P
EM: peter.falkner@esa.int
AF: Research and Scientific Support Department (RSSD), ESA/ESTEC, Keplerlaan, Noordwijk, 2200 AG, Netherlands
AU: Ferri, F
EM: francesca.ferri@unipd.it
AF: CISAS "G. Colombo", University of .Padova, Via Venezia 1, Padova, 35131, Italy
AU: Fulchignoni, M
EM: marcello.fulchignoni@obspm.fr
AF: LESIA, Observ. Paris, Meudon, Place Jansen, Meudon, 92000, France
AB: After HUYGENS landing on Titan, ground permittivity measurements were performed by the mutual impedance (MI) technique during approximately 30mn. The MI probe designed mainly for atmospheric conductivity was set in a dedicated surface mode, working at 5 different frequencies between 45 and 5760 Hz. The measured impedance was processed in the Permittivity, Waves, and Altimetry (PWA) analyzer, a subunit of the Huygens Atmospheric Structure Instrument (HASI). The array configuration on the booms, together with the coupling between the soil and the atmosphere, required a careful evaluation of the attitude of the Huygens Probe on the surface for assessing the dielectric properties with good accuracy. As for atmospheric measurements a detailed numerical model of the HUYGENS conductive body on a flat surface was used for derivation of the ground permittivity. The ground was assumed homogeneous. The accuracy of the results as a function of the landing geometry is estimated and comparisons are made with laboratory samples measurements and CASSINI radar large scale measurements.
DE: 5400 PLANETARY SCIENCES: SOLID SURFACE PLANETS
DE: 5410 Composition (1060, 3672)
DE: 5455 Origin and evolution
DE: 5460 Physical properties of materials
DE: 5470 Surface materials and properties
SC: Planetary Sciences [P]
MN: 2007 Fall Meeting