Scattering Properties and Composition of Cometary Dust |
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Authors: | Ranjan Gupta D B Vaidya J S Bobbie Petr Chylek |
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Institution: | (1) IUCAA, Ganeshkhind, Pune, India;(2) Gujarat College, Ahmedabad, India;(3) Institute for Atmospheric Science, University of Leeds, Leeds, UK;(4) Space and Remote Sensing Sciences, Los Alamos National Laboratory, Los Alamos, NM, USA |
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Abstract: | Composition of the Comet dust obtained by the dust impact analyzer on the Halley probes indicated that the comet dust is a
mixture of silicate and carbonaceous material. The collected interplanetary dust particles (IDP's) are fluffy and composite,
having grains of several different types stuck together. Using discrete dipole approximation (DDA) we study the scattering
properties of composite grains. In particular, we study the angular distribution of the scattered intensity and linear polarization
of composite grains. We assume that the composite grains are made up of a host silicate sphere/spheroid with the inclusions
of graphite. Results of our calculations on the composite grains show that the angle of maximum polarization shifts, and the
degree of polarization varies with the volume fraction of the inclusions. We use these results on the composite grains to
interpret the observed scattering in cometary dust. |
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Keywords: | Dust Scattering Comets Polarization |
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