Physics – Optics
Scientific paper
Jan 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007esasp.643..157m&link_type=abstract
Workshop on Dust in Planetary Systems (ESA SP-643). September 26-30 2005, Kauai, Hawaii. Editors: Krueger, H. and Graps, A., p.1
Physics
Optics
Scientific paper
We present the light absorption cross-section of a mm-size aggregate consisting of large monomers computed by geometric optics using ray tracing. Referring to these cross-sections together with those derived from Mie theory associated with the Maxwell-Garnett mixing rule (MG-Mie), the temperature of such an aggregate at a solar distance of 1 AU is derived. It is found that a significantly lower temperature of 206 K, compared with 280 K for a blackbody, appears for a large silicate aggregate with the equivalent volume of a sphere of 2 mm in radius, while a silicate sphere larger than 1 mm in radius shows a blackbody temperature. Furthermore, the ratio, beta of radiation pressure to solar gravity on such a 2 mm-aggregate, derived by the MG-Mie method, shows a larger beta of 2 times 10^{-4} compared to 10^{-4} for a sphere with an equivalent volume.
Mukai Tadashi
Okada Yasuhiko
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