Microwave Signatures and Surface Properties of Ovda Regio and Surroundings, Venus

Magellan observations of horizontally and vertically polarized emissivity and radar specific cross sections are jointly modeled to separate dielectric constants from textural effects for lobate plains, fractured plains, fracture belts, festoon flows, and tessera in Ovda Regio and surroundings. The m...

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Veröffentlicht in:Icarus (New York, N.Y. 1962) N.Y. 1962), 1994-11, Vol.112 (1), p.171-186
Hauptverfasser: Arvidson, R.E., Brackett, R.A., Shepard, M.K., Izenberg, N.R., Fegley, B., Plaut, J.J.
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container_end_page 186
container_issue 1
container_start_page 171
container_title Icarus (New York, N.Y. 1962)
container_volume 112
creator Arvidson, R.E.
Brackett, R.A.
Shepard, M.K.
Izenberg, N.R.
Fegley, B.
Plaut, J.J.
description Magellan observations of horizontally and vertically polarized emissivity and radar specific cross sections are jointly modeled to separate dielectric constants from textural effects for lobate plains, fractured plains, fracture belts, festoon flows, and tessera in Ovda Regio and surroundings. The model assumes surface emission and scattering dominate and that signatures are controlled by a combination of quasi-specular and diffuse-scale mechanisms. Textural parameters are found to correlate with geology whereas dielectric constants are found to depend on elevation. A gradual increase in dielectric constant from rock-like values (4 to 5) to a value of approximately 50 is evident over the interval from 6054 to 6056 km, where elevations are derived from Magellan altimetry observations. Stereo radargrammetric analyses demonstrate that a return to rock-like values occurs over approximately 0.5 km above the terrain with highest dielectric constants. The abrupt return to rock-like values occurs independently of geology, and reinforces the hypothesis of elevation control on dielectric constant values. Variations in dielectric constant with elevation are modeled using an 1000-ppm concentration of a ferroelectric mineral with a Curie temperature of 707 K. The model reproduces the abrupt change at highest elevations, as the Curie temperature is reached, and the gradual change as lower elevations are encountered. To our knowledge no other model explains the trends with such simplicity.
doi_str_mv 10.1006/icar.1994.1176
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title Microwave Signatures and Surface Properties of Ovda Regio and Surroundings, Venus
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