Extension of RT-CB code to dense discrete random media
- Technische Universität Braunschweig, Institut für Geophysik und Extraterrestrische Physik, Braunschweig, Germany (j.markkanen@tu-bs.de)
Radiative transfer coherent backscattering (RT-CB) code [1,2] is extended to apply for dense discrete random media of optically soft spherical particles. This is achieved by utilizing the well-known static structure factor (SSF) correction derived from the Percus-Yevick approximation for sticky sphere pair correlation function [3]. The resulting dense medium RT-CB resembles to that of the standard RT-CB except the input parameters are modified with the SSF correction. The SSF correction accounts for the collective scattering and the interference effects arising from the correlated positions of particles in a dense medium.
We will verify the code against the numerically exact Fast superposition T-matrix method FaSTMM [4] for a small medium consisting of submicrometer-sized particles at optical wavelengths. We show that the SSF correction significantly improves the accuracy of the RT-CB solution for densely-packed systems of icy particles. Thus,the code may find application in analyzing phootometric and polarimetric observations of icy planetary bodies and dust.
Acknowledgements: This work has received funding from the European Research Council (ERC) - program grant CAstRA, agreement ID 757390.
References:
[1] K. Muinonen, 2004. Waves in Random Media 14(3), 365-388.
[2] T. Väisänen, et al, 2016. Abstract for 2016 URSI International Symposium on Electromagnetic Theory (EMTS), pp. 396-399.
[3] L. Tsang, J. Kong, K. Ding, O. Ao, Scattering of Electromagnetic Waves, Numerical Simulations, Vol. 2, 2001.
[4] J. Markkanen & A. Yuffa, 2017, Journal of Quantitative Spectroscopy and Radiative Transfer 189, 181-188.
How to cite: Markkanen, J.: Extension of RT-CB code to dense discrete random media, Europlanet Science Congress 2022, Granada, Spain, 18–23 Sep 2022, EPSC2022-793, https://doi.org/10.5194/epsc2022-793, 2022.
