Radar scattering by boulders studied using geometric optics

被引：4

作者：

Virkki, A. ^{[1
]}

Muinonen, K. ^{[1
,2
]}

机构：

[1] Univ Helsinki, Dept Phys, POB 64, FIN-00014 Helsinki, Finland

[2] Finnish Geospatial Res Inst, FI-02430 Masala, Finland

来源：

PLANETARY AND SPACE SCIENCE | 2015年 / 118卷

基金：

芬兰科学院;

关键词：

Electromagnetic scattering; Geometric optics; Gaussian-random spheres; Radar; Albedo; Circular polarization; GALILEAN SATELLITES; PARTICLES; LIGHT; DEPOLARIZATION;

D O I：

10.1016/j.pss.2015.04.017

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We simulate radar scattering from meter-scale boulders of ice and rock using an algorithm of geometric optics. The scattering particles are Gaussian-random-sphere particles with different levels of irregularity. We study the effect of particle size, geometry, and material on the radar albedo and circular polarization ratio at microwaves concentrating on the S-band wavelength of 12.6 cm. We show that increased absorption causes the radar albedos in both polarization states to attenuate exponentially when the contribution of the internally scattered waves decreases. Consequently, also the polarization ratio decreases. Semi-empirical models for the radar albedos are derived. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：277 / 284

页数：8

共 28 条

[1] COHERENT BACKSCATTERING OF LIGHT BY DISORDERED MEDIA - ANALYSIS OF THE PEAK LINE-SHAPE [J].

AKKERMANS, E ;

WOLF, PE ;

MAYNARD, R .

PHYSICAL REVIEW LETTERS, 1986, 56 (14) :1471-1474

[2] Near-Earth asteroid surface roughness depends on compositional class [J].

Benner, Lance A. M. ;

Ostro, Steven J. ;

Magri, Christopher ;

Nolan, Michael C. ;

Howell, Ellen S. ;

Giorgini, Jon D. ;

Jurgens, Raymond F. ;

Margot, Jean-Luc ;

Taylor, Patrick A. ;

Busch, Michael W. ;

Shepard, Michael K. .

ICARUS, 2008, 198 (02) :294-304

[3] Icy Galilean satellites: Modeling radar reflectivities as a coherent backscatter effect [J].

Black, GJ ;

Campbell, DB ;

Nicholson, PD .

ICARUS, 2001, 151 (02) :167-180

[4]

Bohren C. F., 1998, ABSORPTION SCATTERIN

[5] Stony meteorite porosities and densities: A review of the data through 2001 [J].

Britt, DT ;

Consolmagno, GJ .

METEORITICS & PLANETARY SCIENCE, 2003, 38 (08) :1161-1180

[6] GALILEAN SATELLITES - 1976 RADAR RESULTS [J].

CAMPBELL, DB ;

CHANDLER, JF ;

OSTRO, SJ ;

PETTENGILL, GH ;

SHAPIRO, II .

ICARUS, 1978, 34 (02) :254-267

[7] ELECTRICAL PROPERTIES OF ROCKS AND THEIR SIGNIFICANCE FOR LUNAR RADAR OBSERVATIONS [J].

CAMPBELL, MJ ;

ULRICHS, J .

JOURNAL OF GEOPHYSICAL RESEARCH, 1969, 74 (25) :5867-+

[8] The population of natural Earth satellites [J].

Granvik, Mikael ;

Vaubaillon, Jeremie ;

Jedicke, Robert .

ICARUS, 2012, 218 (01) :262-277

[9]

Harmon J.K., 2004, Radar studies of comet nuclei and grain comae, P265

[10] RADAR OBSERVATIONS OF COMET IRAS-ARAKI-ALCOCK 1983D [J].

HARMON, JK ;

CAMPBELL, DB ;

HINE, AA ;

SHAPIRO, II ;

MARSDEN, BG .

ASTROPHYSICAL JOURNAL, 1989, 338 (02) :1071-1093

← 1 2 3 →