The zodiacal light from 1500 A to 60 micron - Mie scattering and thermal emission

Details The zodiacal light from 1500 A to 60 micron - Mie scattering and thermal emission The zodiacal light from 1500 A to 60 micron - Mie scattering and thermal emission

Jul 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....67..381r&link_type=abstract

Astronomy and Astrophysics, vol. 67, no. 3, July 1978, p. 381-394.

Astronomy and Astrophysics

Astrophysics

48

Interplanetary Dust, Mie Scattering, Thermal Emission, Zodiacal Light, Andesite, Brightness, Graphite, Obsidian, Olivine, Polarization Characteristics, Refractivity, Temperature Distribution

Scientific paper

Using the grain-size spectrum derived from measurements in situ, the spatial dust distribution deduced from Helios and Pioneer results, and Mie theory with measured refractive indices of obsidian, andesite, olivine, magnetite, and graphite, a wavelength-dependent model of the zodiacal light (ZL) is discussed. A good absolute fit of the observed visual brightness and polarization over the whole sky is obtained. For all materials a marked darkening of the ZL shortwards of 2000 A is found, while in the optical domain the spectrum is solarlike. Between 5 and 10 microns different substances yield fluxes which differ by up to about two orders of magnitude; detailed measurements at these wavelengths should clarify the composition of the interplanetary dust. The computed spectra show no excess at 10 and 20 microns due to silicate features. There are difficulties in explaining the features observed in the near-IR radiation from the F corona.

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