基于双基地雷达观测的金星表面电学特性

Electrical Properties of the Venus Surface from Bistatic Radar Observations.

作者信息

Pettengill GH, Ford PG, Simpson RA

机构信息

G. H. Pettengill and P. G. Ford, Center for Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. R. A. Simpson, Center for Radar Astronomy, Stanford University, Stanford, CA 94305, USA.

出版信息

Science. 1996 Jun 14;272(5268):1628-31. doi: 10.1126/science.272.5268.1628.

DOI:10.1126/science.272.5268.1628

PMID:8662473

Abstract

A bistatic radar experiment in 1994, involving reception on Earth of a specularly reflected, linearly polarized 13-centimeter-wavelength signal transmitted from the Magellan spacecraft in orbit around Venus, has established that the surface materials viewed at low and intermediate altitudes on Venus have a relative dielectric permittivity of 4.0 ± 0.5. However, bistatic results for the Maxwell Montes highlands imply an electrically lossy surface with an imaginary dielectric permittivity of -i 100 ± 50, probably associated with a specific conductivity of about 13 mhos per meter. Candidates for highlands surface composition include ferroelectrics, a thin frost of elemental tellurium, or a plating of magnetite or pyrites.

摘要

1994年进行的一次双基地雷达实验，涉及在地球上接收从环绕金星运行的麦哲伦号航天器发射的、镜面反射的、线偏振的13厘米波长信号，该实验已确定在金星低海拔和中海拔处观测到的表面物质的相对介电常数为4.0 ± 0.5。然而，麦克斯韦山脉高地的双基地雷达实验结果表明，其表面存在电损耗，虚部介电常数为 -i 100 ± 50，这可能与约13西门子每米的电导率有关。高地表面成分的候选物质包括铁电体、元素碲的薄霜，或磁铁矿或黄铁矿的镀层。