Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.p42a..06s&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #P42A-06
Astronomy and Astrophysics
Astronomy
0659 Random Media And Rough Surfaces, 5109 Magnetic And Electrical Properties (0925), 5470 Surface Materials And Properties, 6295 Venus, 6949 Radar Astronomy
Scientific paper
Toward the end of the Magellan mission, several bistatic radar experiments were conducted using the spacecraft's linearly polarized transmissions at 13 cm wavelength. Ground reception was in right- and left- circular polarizations (RCP and LCP, respectively). Echoes from Maxwell Montes showed unusual polarization properties, which were interpreted as coming from a surface with a complex dielectric constant (Pettengill et al., Science, 272, 1628-1631, 1996). On early orbits of Venus Express (VEX) similar experiments were carried out, albeit with VEX's more conventional RCP transmissions and at lower signal-to-noise ratio than for Magellan. As expected, dielectric constants from VEX are generally higher than for other bodies (such as the Moon and Mars), based on echo power ratios (RCP/LCP). At the time of this writing, however, the expected change in polarization from preliminary coherent processing of RCP and LCP over Maxwell has not been detected.
Haeusler Bernd
Paetzold Martin
Simpson Richard A.
Tyler Leonard G.
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