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Medientyp:
E-Artikel
Titel:
Estimating the Asteroidal Component of the Zodiacal Cloud using the Earth's Resonant Ring
Beteiligte:
Jayaraman, Sumita;
Dermott, Stanley F.
Erschienen:
Cambridge University Press (CUP), 1996
Erschienen in:International Astronomical Union Colloquium
Sprache:
Englisch
DOI:
10.1017/s0252921100501456
ISSN:
0252-9211
Entstehung:
Anmerkungen:
Beschreibung:
<jats:title>Abstract</jats:title><jats:p>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 — 30<jats:italic>μ</jats:italic>m 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 <jats:italic>p</jats:italic>, the slope of the size-frequency distribution of particles.</jats:p>