Computer Science – Sound
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufm.p13c..02p&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #P13C-02
Computer Science
Sound
5460 Physical Properties Of Materials, 5464 Remote Sensing, 5494 Instruments And Techniques, 6225 Mars
Scientific paper
The Mars Advanced Radar for Subsurface and Ionospheric Sounding (MARSIS), aboard the Mars Express orbiter, began routine science observations in early July, 2005. The radar operates in two primary modes, subsurface sounding and ionospheric sounding. The objective of the subsurface experiment is to detect and characterize subsurface material discontinuities in the upper several km of the martian crust, some of which may be related to the presence of water (liquid or solid). In the subsurface sounding mode, one or two of four frequency bands in the range of 1.3-5.5 MHz can be selected. The lower frequency bands are expected to penetrate more deeply, but cannot be used when the dayside ionosphere is beneath the spacecraft. The orbit of Mars Express oscillates between periods of day and night peripases; July and August, 2005 included some nightside coverage, while September-November are dayside only. Subsurface sounding data have a lateral resolution of 5-10 km and a vertical resolution of 100 m in free space (about 50 m in crustal materials). The MARSIS radar has been performing nominally since turn-on. Echoes from the surface are typically strong, with signal-to-noise ratios in the range of 30-50 dB. Later returns from off-nadir topographic clutter are evident and easily modeled using MOLA topography data. Many late echoes are observed that cannot be explained as topographic clutter. These features are under investigation as potential subsurface interfaces. As the periapsis of the Mars Express orbit migrates toward the south pole, the polar layered deposits and related landforms will be observed by MARSIS on the nightside. In addition, numerous targets of interest in the southern mid-latitudes will be acquired during the nightside, including the floors of Hellas and Argyre basins, and the regions of strong remnant crustal magnetization.
Calabrese Diego
Cicchetti Andrea
Clifford Stephen
Farrell William
Federico Cinzia
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