CAOSP abstracts, Volume: 27, No.: 1, year: 1997
- Author(s): KOCIFAJ, M.; KAPISINSKY, I.
- Journal: Contributions of the Astronomical Observatory Skalnate Pleso,
vol. 27, no. 1, p. 5-14.
- Date: 04/1997
- Title: Optical effects of dust particles of different shapes
- Keyword(s): COSMIC DUST PARTICLES, RADIATION PRESSURE, RADIATION SCATTERING,
PARTICLE REFRACTIVE INDEX
- Pages: 5 -- 14
Abstract:
Cosmic dust dynamics depends not only on many nongravitational effects, but
also on the physical and optical properties of particles. In this connection
important optical factors such as the complex refractive index m and the
efficiency factor for radiation pressure Q_pr, strongly depend on the shape of
particle. The paper presents precise calculations of the Q_pr factor and
applying the Discrete Dipole Approximation method to six particles of different
shapes (sphere, cylinder, ellipsoid, hexagonal prism, rectangular target,
tetrahedron). The high variability of the Q_pr and scattering phase functions
values for some specially shaped particle models, presented in both tabulated
and graphical forms, confirms the strong dependence of the dynamical-optical
factors on the shape parameter. This dependence is more significant for
particles of irregular shape, especially for cylinders in our particle sample.
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