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Estimating the Asteroidal Component of the Zodiacal Cloud using the Earth's Resonant Ring

Published online by Cambridge University Press:  27 February 2018

Sumita Jayaraman  and
Stanley F. Dermott
Sumita Jayaraman
Affiliation:
The University of Florida Department of Astronomy, 211 Space Sciences Building, Gainesville, FL 32611-2055
Stanley F. Dermott
Affiliation:
The University of Florida Department of Astronomy, 211 Space Sciences Building, Gainesville, FL 32611-2055

Abstract

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The Earth's resonant ring is populated primarily by asteroidal dust particles because cometary particles have higher Poynting-Robertson drag rates and the Earth's resonances are not strong enough to trap them (Gomes, 1995). It has been shown that asteroidal particles in a limited size range from 5 — 30μm are responsible for the observed trailing/leading flux asymmetry caused by the trailing dust cloud embedded in the ring (Jayaraman and Dermott 1995). The magnitude of the flux asymmetry is a direct function of the area of dust in the ring, which in turn depends upon the number of asteroidal particles in the zodiacal cloud. Using a dynamical model of the ring and the background zodiacal cloud and estimating the surface area of dust needed in the ring to match the observed flux asymmetry in the 25 micron COBE waveband, we have calculated the fraction of asteroidal dust in the zodiacal cloud as a function of p, the slope of the size-frequency distribution of particles.

Type
IV. Origin of the Interplanetary Dust Cloud
Information
International Astronomical Union Colloquium , Volume 150: Physics, Chemistry and Dynamics of Interplanetary Dust , 1996 , pp. 155 - 158
Copyright
Copyright © Astronomical Society of the Pacific 1996

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