Laboratory Characterisation and Radio-echo Simulations To Evaluate Potential Sounding Sites For Water Identification On Mars | INSTITUT DE PHYSIQUE DU GLOBE DE PARIS

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  Laboratory Characterisation and Radio-echo Simulations To Evaluate Potential Sounding Sites For Water Identification On Mars

Type de publication:

Journal Article

Source:

EGS XXVII General Assembly, Nice, 21-26 April 2002, abstract #1011, Volume 27, p.1011 (2002)

URL:

http://adsabs.harvard.edu/abs/2002EGSGA..27.1011H

Mots-clés:

Etudes spatiales et planétaires, UMR 7096

Résumé:

Radar sounder on Mars can probes the subsurface layers to varying depth depending on the geoelectrical properties of the soil. Hence a good knowledge of the electri- cal properties of the investigated media is essential for future data interpretation. We present in this work low frequency laboratory characterisation of volcanic and sedi- mentary materials as basalts, magnetite, montmorillonite, aragonite and others at the frequency band 1-30 MHz, thus covering the frequency range of MARSIS experi- ment on board the Mars Express orbiter (ESA-2003), the 2005 Shallow depth sounder (NASA-ASI) and the Netlander (CNES-2007) ground penetrating radar. We then con- structed four frequency dependent geoelectrical models for local Martian sites where young fluvial feature have been recently observed by the high resolution MOC images, suggesting the presence of near subsurface ground ice. Those sites represent potential landing sites for the Netlander experiment. Finally we simulated the expected radar echo arising from each site at two frequencies, 2 and 25 MHz, to evaluate the perfor- mances of each instrument and specify adequate geophysical and geoelectrical sound- ing context for each of those probing techniques, in order to expect an unambiguous detection of subsurface water reservoirs.