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Radiation pressure forces of fluffy porous grains

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Title: Radiation pressure forces of fluffy porous grains
Authors: Mukai, T. Browse this author
Ishimoto, H. Browse this author
Kozasa, T. Browse this author →KAKEN DB
Blum, J. Browse this author
Greenberg, J.M. Browse this author
Keywords: radiation pressure forces
interplanetary dust
irregularly shaped particles
Issue Date: Aug-1992
Publisher: EDP Sciences
Journal Title: Astronomy and Astrophysics
Volume: 262
Issue: 1
Start Page: 315
End Page: 320
Abstract: Based on Mie theory and Maxwell-Garnett effective medium theory (MG-Mie), we have examined a ratio β of the radiation pressure forces to the gravity on porous aggregates with fractal structures, which consist of absorbing (graphite or magnetite) or dielectric (silicate) materials. A comparison of β by MG-Mie theory with those computed by the discreate dipole approximation (DDA) has shown that when the dust aggregates have rather compact structures and/or the constituent particles are absorbing materials, the values of β by DDA theory are reproduced reasonably by MG-Mie theory. Furthermore, it is found that (i) the higher the porosity, the smaller the value of β becomes near the maximum of β at a characteristic radius of the aggregate of about 0.1 μm. (ii) For very porous aggregates, β does not depend on size in contrast to a remarkable size dependence of β for compact spheres. (iii) It would be expected from the MG-Mie theory that regardless of the chemical composition of constituents, β of porous grains approaches a constant value, which is close to that for the individual constituent particle, as the porosity increases. Consequently, when the radiation pressure forces are significant in comparison with the gravity, the dynamical behaviour of large fluffy particles with high porosity in the interplanetary space seems to be similar to that of the small compact particles which make up their internal structure.
Rights: © 1992 ESO
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 小笹 隆司

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