Radar backscattering from a large-grain cometary coma: numerical simulation

被引：3

作者：

Dogra, Shraddha ^{[1
,2
]}

Grynko, Yevgen ^{[2
]}

Zubko, Evgenij ^{[3
]}

Foerstner, Jens ^{[2
]}

机构：

[1] Paderborn Univ, Dept Elect Engn, Warburger Str 100, D-33098 Paderborn, Germany

[2] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA

[3] Far Eastern Fed Univ, Sch Nat Sci, 8 Sukhanova St, Vladivostok 690950, Russia

来源：

ASTRONOMY & ASTROPHYSICS | 2017年 / 608卷

关键词：

methods: numerical; comets: general; scattering; LIGHT-SCATTERING; SEMITRANSPARENT PARTICLES; OPTICS APPROXIMATION; POLARIZATION;

D O I：

10.1051/0004-6361/201730801

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We numerically simulate the circular polarization ratio of the radar signal backscattered from a large-grain cometary coma and compare the simulation results with the radar measurements for seven comets. We apply the discrete dipole approximation method and a model of random irregular particles. Our results confirm water ice composition of the cm-sized chunks detected by the NASA Deep Impact space probe in the vicinity of the nucleus of Comet 103P/Hartley 2. The index of the power-law size distribution in this case can be constrained to the range n approximate to 3.3-4.3. For the other considered comets the circular polarization ratio can be reproduced with variations of the power index between 2 and 5.

引用

页数：5

共 30 条

[1] EPOXI at Comet Hartley 2
A'Hearn, Michael F.
Belton, Michael J. S.
Delamere, W. Alan
Feaga, Lori M.
Hampton, Donald
Kissel, Jochen
Klaasen, Kenneth P.
McFadden, Lucy A.
Meech, Karen J.
Melosh, H. Jay
Schultz, Peter H.
Sunshine, Jessica M.
Thomas, Peter C.
Veverka, Joseph
Wellnitz, Dennis D.
Yeomans, Donald K.
Besse, Sebastien
Bodewits, Dennis
Bowling, Timothy J.
Carcich, Brian T.
Collins, Steven M.
Farnham, Tony L.
Groussin, Olivier
Hermalyn, Brendan
Kelley, Michael S.
Li, Jian-Yang
Lindler, Don J.
Lisse, Carey M.
McLaughlin, Stephanie A.
Merlin, Frederic
Protopapa, Silvia
Richardson, James E.
Williams, Jade L.
[J]. SCIENCE, 2011, 332 (6036) : 1396 - 1400
[2] Bohren C.F., 2003, Absorption and scattering of light by small particles
[3] ELECTRICAL PROPERTIES OF ROCKS AND THEIR SIGNIFICANCE FOR LUNAR RADAR OBSERVATIONS
CAMPBELL, MJ
ULRICHS, J
[J]. JOURNAL OF GEOPHYSICAL RESEARCH, 1969, 74 (25): : 5867 - +
[4] Chandrasekhar S, 1960, RAD TRANSFER, P416
[5] Modelling the polarization properties of Comet 1P/Halley using a mixture of compact and aggregate particles
Das, H. S.
Paul, D.
Suklabaidya, A.
Sen, A. K.
[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2011, 416 (01) : 94 - 100
[6] ISOCAM imaging of Comets 103P/Hartley 2 and 2P/Encke
Epifani, E
Colangeli, L
Fulle, M
Brucato, JR
Bussoletti, E
De Sanctis, MC
Mennella, V
Palomba, E
Palumbo, P
Rotundi, A
[J]. ICARUS, 2001, 149 (02) : 339 - 350
[7] The dust mass distribution of comet 81P/Wild 2
Green, SF
McDonnell, JAM
McBride, N
Colwell, MTSH
Tuzzolino, AJ
Economou, TE
Tsou, P
Clark, BC
Brownlee, DE
[J]. JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS, 2004, 109 (E12) : 1 - 13
[8] Scattering matrix calculated in geometric optics approximation for semitransparent particles faceted with various shapes
Grynko, Y
Shkuratova, Y
[J]. JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER, 2003, 78 (3-4) : 319 - 340
[9] Grynko Y., 2002, OPT SPECTROSC, V93, P885
[10] Ray tracing sumulation of light scattering by spherical clusters consisting of particles with different shapes
Grynko, Yevgen
Shkuratov, Yurly
[J]. JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER, 2007, 106 (1-3) : 56 - 62

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