C. L. Lichtenberg P. Spudis R. Bonner W. Ort E. Malaret M. Robinson E.M. Shoemaker Stewart Nozette 1996 <div id="abstracts"><div class="core-container"><div>During the Clementine 1 mission, a bistatic radar experiment measured the magnitude and polarization of the radar echo versus bistatic angle, β, for selected lunar areas. Observations of the lunar south pole yield a same-sense polarization enhancement around β = 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.</div></div></div> application/pdf 10.1126/science.274.5292.1495 en American Association for the Advancement of Science The Clementine bistatic radar experiment article