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اخترفیزیک و علوم فضایی 2013
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  • stochastic transfer of polarized radiation in finite cloudy atmospheric media with reflective boundaries

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 879
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     the problem of monoenergetic radiative transfer in a finite planar stochastic atmospheric medium with polarized (vector) rayleigh scattering is proposed. the solution is presented for an arbitrary absorption and scattering cross sections. the extinction function of the medium is assumed to be a continuous random function of position, with fluctuations about the mean taken as gaussian distributed. the joint probability distribution function of these gaussian random variables is used to calculate the ensemble-averaged quantities, such as reflectivity and transmissivity, for an arbitrary correlation function. a modified gaussian probability distribution function is also used to average the solution in order to exclude the probable negative values of the optical variable. pomraning-eddington approximation is used, at first, to obtain the deterministic analytical solution for both the total intensity and the difference function used to describe the polarized radiation. the problem is treated with specular reflecting boundaries and angular-dependent externally incident flux upon the medium from one side and with no flux from the other side. for the sake of comparison, two different forms of the weight function, which introduced to force the boundary conditions to be fulfilled, are used. numerical results of the average reflectivity and average transmissivity are obtained for both gaussian and modified gaussian probability density functions at the different degrees of polarization.

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