Computer Science – Sound
Scientific paper
Aug 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mpse.conf...46f&link_type=abstract
International Conference on Mars Polar Science and Exploration, p. 46
Computer Science
Sound
Polar Regions, Ice, Radio Frequencies, Sounding, Crystals, Antarctic Regions, Mars (Planet), F Region, Dielectric Properties, Radar Data, Snow, Water, Electromagnetic Scattering
Scientific paper
Radio frequency radar sounding is now an essential part of methodology to observe the ice sheets on polar continents. We can detect physical conditions within the several thousand meters thick ice sheets using proper platforms such as ground-based vehicles or airplanes. We can also extend information of ice-core data from a drilling point to wider regions of polar ice sheets. Ice sounding technique has its basis in the high-frequency dielectric properties of the target object, that is, ice and snow. In the past decade, new progress has appeared in understanding of the high-frequency electrical properties of water ice (Ih) through laboratory measurements. This progress consequently brought about significant progress in interpretation of the radar data from Antarctica. In particular, using multiple frequencies, we can distinguish reflections due to changes in dielectric permittivity and due to changes in electrical conductivity. Through this discrimination, we can deduce that what factor (density, impurity or crystal orientation fabrics) cause electromagnetic scattering. We introduce the physical principles of the ice-radar-data interpretation using actual data from a traverse line Dome F region to marginal area in Antarctica, and present knowledge of the dielectric properties of ice and its limitations. We mainly put stress on the knowledge of water ice and data from Antarctic ice sheet, considering application and extension of the knowledge to the Mars polar region.
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