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1. Radiation Pressure and Poynting-Robertson Drag for Small Spherical Particles

Published online by Cambridge University Press:  12 April 2016

S. Soter ,
J. A. Burns  and
P. L. Lamy

Abstract

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A new heuristic derivation of the radiation pressure and Poynting-Robertson drag forces is presented for particles with general optical properties; previous derivations considered only perfectly absorbing materials. The equation of motion for a particle of mass m and geometrical cross-section A, moving with velocity v through a radiation field of energy flux F, is (to terms of order v/c)

where r̂ is the radial unit vector, ṙ is the radial velocity, and c is the speed of light. The radiation pressure efficiency factor Qpr includes both scattering and absorption, it is evaluated using Mie theory for small spherical particles with measured optical properties that are irradiated by the actual solar spectrum. Very small particles (<0.01 μm) are not substantially affected by radiation forces.

Type
Part III. Meteors and Meteoroids
Information
International Astronomical Union Colloquium , Volume 39: Comets, Asteroids, Meteorites: Interrelations, Evolution and Origins , December 1977 , pp. 121 - 125
Copyright
Copyright © A.H. Delsemme 1977

References

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van de Hulst, H. C. 1957, Light Scattering by Small Particles, Wiley, New York.Google Scholar