Physics
Scientific paper
Mar 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21..469s&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 6, p. 469-472
Physics
14
Emissivity, Ferroelectricity, Highlands, Minerals, Rocks, Venus (Planet), Venus Surface, Altitude, Mathematical Models, Permittivity, Variations, Venus, Highlands, Emissivity, Model, Minerals, Ferroelectric Material, Dielectric Constant, Elevation, Ovda Regio, Perovskite, Magellan Mission, Pyrochlore, Spacecraft Observations
Scientific paper
A model to explain the low emissivity venusian highlands is proposed utilizing the temperature-dependent dielectric constant of ferroelectric minerals. Ferroelectric minerals are known to occur in alkaline and carbonite rocks, both of which are plausible for Venus. Ferroelectric minerals possess extremely high dielectric constants (105) over small temperature intervals and are only required in minor (much less than 1%) abundances to explain the observed emissivities. The ferroelectric model can account for: (1) the observed reduction in emissivity with increased altitude, (2) the abrupt return to normal emissivities at highest elevations, and (3) the variations in the critical elevation observed from region to region.
Arvidson Ray E.
Brackett Robert A.
Fegley Bruce
Shepard Michael K.
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