title: Radar evidence for liquid surfaces on Titan.
abstract: Arecibo radar observations of Titan at 13-centimeter wavelength indicate that most of the echo power is in a diffusely scattered component but that a small specular component is present for about 75% of the subearth locations observed. These specular echoes have properties consistent with those expected for areas of liquid hydrocarbons. Knowledge of the areal extent and depth of any deposits of liquid hydrocarbons could strongly constrain the history of Titan's atmosphere and surface.
authors.affiliation: National Astronomy and Ionosphere Center and Department of Astronomy, Space Sciences Building, Cornell University, Ithaca, NY 14853, USA. campbell@astro.cornell.edu
authors.forename: Donald B
authors.initials: DB
authors.lastname: Campbell
authors.forename: Gregory J
authors.initials: GJ
authors.lastname: Black
authors.forename: Lynn M
authors.initials: LM
authors.lastname: Carter
authors.forename: Steven J
authors.initials: SJ
authors.lastname: Ostro
mesh_terms: D055580:Astronomical Phenomena; D001256:Astronomy; D001272:Atmosphere; D005118:Extraterrestrial Environment; D006838:Hydrocarbons; D007053:Ice; D011825:Radar; D018539:Saturn; D014867:Water
chemical_list: D006838:Hydrocarbons; D007053:Ice; D014867:Water