An easy-to-use Model for the Optical Thickness and Ambient Illumination within Cometary Dust Comae |
| |
Authors: | Müller Michael Green Simon F McBride Neil |
| |
Institution: | (1) Planetary and Space Sciences Research Institute, The Open University, Walton Hall, Milton Keynes, MK7 6AA, UK |
| |
Abstract: | We define a procedure which allows estimation of the optical thickness of a cometarydust coma and the ambient illumination
of the nucleus for any given comet, if estimatesof the nucleus radius and the dust activity (Afρ) are available. The calculation
isperformed for a singly scattering coma with a cos(ϑ) distribution of dust overits day side. We find that the ambient illumination
is of the same order as the incidentsunlight if the optical thickness is of order one. The optical thickness increases, all
elseequal, linearly with the nucleus radius. Therefore the effect of the presence of the comamay be neglected for small (≈
1 km diameter) comets, but is important forcomets such as 1P/Halley and Hale–Bopp. |
| |
Keywords: | Comets dust optical thickness radiative transfer |
本文献已被 SpringerLink 等数据库收录! |
|