Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.1603h&link_type=abstract
American Astronomical Society, DPS meeting #28, #16.03; Bulletin of the American Astronomical Society, Vol. 28, p.1120
Astronomy and Astrophysics
Astronomy
Scientific paper
The extent to which an asteroidal model of the zodiacal cloud can account for observations made by the Cosmic Background Explorer (COBE) satellite is investigated. COBE observations of the cloud can be used to constrain the range of forced elements of the cloud particles. The positions of the nodes as measured from the polar brightnesses in the COBE data give an indication of the forced inclination (I_f) and forced node (Omega_f ) for the particles in the vicinity of 1 AU. This is a measure of the orientation of the local plane of the cloud with respect to the ecliptic plane. The variation of the peak brightness with ecliptic longitude of Earth is a measure of the forced eccentricity (e_f) and forced pericenter (omega_f ) of the cloud. This measures the extent to which the Sun's position is shifted from the center of symmetry of the cloud. The variation in latitude of the peak ecliptic brightness gives a measure of the forced inclination (I_f) and forced node (Omega_f ) of the symmetry plane. Variations of the forced elements along the plane show to what extent the cloud is warped. The forced elements give an indication of the drag rate affecting the particles which in turn is dependent on particle size. Initially, models are made using particles of the same diameter, but to obtain a more realistic model, a model containing multiple particle sizes constrained by a particular size-frequency distribution is constructed. The composite model includes particles with diameters ranging from 1 microns to 50 microns .
Dermott Stanley F.
Grogan Keith
Holmes Elizabeth Katherine
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