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Colour dependence of zodiacal light modelsColour models of the zodiacal light in the ecliptic have been calculated for both dielectric and metallic particles in the sub-micron and micron size range. Two colour ratios were computed, a blue ratio and a red ratio. The models with a size distribution proportional to s to the -2.5 power ds (where s is the particle radius) generally show a colour close to the solar colour and almost independent of elongation. Especially in the blue colour ratio there is generally no significant dependence on the lower cutoff size (0.1-1 micron). The main feature of absorbing particles is a reddening at small elongations. The models for size distributions proportional to s to the -4 power ds show larger departures from solar colour and more variation with model parameters. Colour measurements, including red and near infra-red, therefore are useful to distinguish between flat and steep size spectra and to verify the presence of slightly absorbing particles.
Document ID
19740031470
Document Type
Reprint (Version printed in journal)
Authors
Giese, R. H. (Ruhr-Universitaet Bochum, Germany)
Hanner, M. S. (Dudley Observatory Albany, N.Y., United States)
Leinert, C. (Max-Planck-Institut fuer Astronomie Heidelberg, Germany)
Date Acquired
August 7, 2013
Publication Date
December 1, 1973
Publication Information
Publication: Planetary and Space Science
Volume: 21
Subject Category
GEOPHYSICS
Funding Number(s)
CONTRACT_GRANT: NSF GA-27676
CONTRACT_GRANT: BMBW-WRK-228
CONTRACT_GRANT: NGR-33-011-017
CONTRACT_GRANT: BMBW-8591-RS21
Distribution Limits
Public
Copyright
Other