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Science. 1996 Nov 29;274(5292):1495-8.

The Clementine bistatic radar experiment.

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  • 1U.S. Air Force Phillips Laboratory, Space Experiments Directorate, 711 North Fayette Street, Alexandria, VA 22314, USA.


During the Clementine 1 mission, a bistatic radar experiment measured the magnitude and polarization of the radar echo versus bistatic angle, beta, for selected lunar areas. Observations of the lunar south pole yield a same-sense polarization enhancement around beta = 0. Analysis shows that the observed enhancement is localized to the permanently shadowed regions of the lunar south pole. Radar observations of periodically solar-illuminated lunar surfaces, including the north pole, yielded no such enhancement. A probable explanation for these differences is the presence of low-loss volume scatterers, such as water ice, in the permanently shadowed region at the south pole.

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