Retrieval of Local Interplanetary Dust Emissivity by ASTRO-F

Details Retrieval of Local Interplanetary Dust Emissivity by ASTRO-F Retrieval of Local Interplanetary Dust Emissivity by ASTRO-F

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jkas...37..159h&link_type=abstract

Journal of the Korean Astronomical Society, vol. 37, no. 4, pp. 159-169

Astronomy and Astrophysics

Astronomy

2

Zodiacal Emission, Interplanetary Dusts, Ir Emissivity, Density-Temperature Degeneracy

Scientific paper

This is a proposal to probe local part of the interplanetary dust (IPD) cloud complex and retrieve mean volume emissivity of the local IPDs at mid-infrared wavelengths. This will be done by monitoring, with Infrared Camera (IRC) aboard the ASTRO-F, the annual modulation of the zodiacal emission. In pointing mode of the ASTRO-F mission the spacecraft can make attitude maneuvering over approximately ±1° range centered at solar elongation 90° in the ecliptic plane. The attitude maneuvering combined with high sensitivity of the IRC will provide us with a unique opportunity observationally to take derivatives of the zodiacal emission brightness with respect to the solar elongation. From the resulting differential of the brightness over the ±1° range, one can directly determine the mean volume emissivity of the local IPDs with a sufficient accuracy to de-modulate the annual emissivity variations due to the Earth's elliptical motion and the dis-alignment of the maximum IPD density plane with respect to the ecliptic. The non-zero eccentricity (e⊕= 0.0167) of the Earth's orbit combined with the sensitive temperature dependence of the Planck function would bring modulations of amplitude at least 3.34% to the zodiacal emission brightness at mid-infrared wavelengths, with which one may determine the IPD temperature T(r) and mean number density n(r) as functions of heliocentric distance r. This will in turn fix the power-law exponent δ in the relation T(r) = To (r/ro)-δ for the dust temperature and ν in n(r) = no (r/ro)-ν for the density. We discuss how one may de-couple the notorious degeneracy of cross-section, density, reference temperature To and exponent δ.

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