Документ взят из кэша поисковой машины. Адрес
оригинального документа
: http://www.astro.spbu.ru/DOP/8-GLIB/op/
Дата изменения: Fri Nov 19 12:11:33 2010 Дата индексирования: Thu Feb 27 21:02:30 2014 Кодировка: Поисковые слова: star |
Optical properties of porous particles | |||||||||||||||||||||
Here we compare the optical properties of porous particles of two kinds:
The parameters are To compute the properties of the aggregates and of the homogeneous spheres the DDA method and the Mie theory with the Bruggeman rule of the EMT were utilized, respectively (see for more details the paper of Voshchinnikov et al., 2007). Below we show the behaviour of the efficiency factors Qext (x), Qsca (x), Qabs (x), the asymmetry parameter g (x) and albedo (x) as well as for x = 3 and 100 the phase function i (theta) and polarization of scattered radiation p (theta) for different values of the parameters m and P.
The refractive index m is chosen to be The effective refractive indices of the homogeneous spheres are indicated in Table. The porosity is taken to be P = 0.33 and 0.9. Effective refractive indices calculated using EMT (the Bruggeman rule)
For given porosity, the particles of the same size parameter xporous = xcompact/(1-P)1/3 (see for more details Voshchinnikov et al., 2007) and hence of the same mass are compared in the following figures organized in the tables. |