Improvement of the Mean Field T-Matrix method for scattering by fractal aggregates of identical spheres in astrophysical environments

IF 2.5 2区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS Icarus Pub Date : 2024-08-06 DOI:10.1016/j.icarus.2024.116247
P. Rannou , R. Botet , R. Tazaki
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Abstract

Aggregated particles and aerosols are common in natural or industrial environments. Analysing their scattering and absorption properties with precise methods may prove useful for gaining information about real particles, using remote sensing or in situ active optical instruments in natural environments. Many methods, with varying complexities, were developed in the past. For aggregates of spheres, the most recent version of the T-Matrix method by Mackowski and Mishchenko (2011) is able to treat the problem almost exactly and can yield all the details of the scattering properties. However, for computational reasons, the T-Matrix method cannot handle large particles. In order to deal with large particles, a mean-field version of the T-Matrix theory was developed by Botet et al. (1997) for aggregates of identical spheres and used in particular to analyse the case of Titan haze. This mean-field T-Matrix method is efficient to quickly calculate accurate approximations of many optical properties of aggregates of Mie spheres, but it is inherently limited by the mean field approximations. It uses crude approximation of the pair-correlation functions (Seignovert et al., 2017) and leads to inaccurate estimations in the geometrical optics limit (Tazaki and Tanaka, 2018). In the present work, we bring improvements that overcome these two limitations. This significantly increases the validity range of the method and its accuracy. We display comparisons with the results obtained with T-Matrix method in order to assess the performance of the new version of the mean field method (MFT-M+).

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改进天体物理环境中相同球体分形聚集体散射的平均场 T-Matrix 方法
聚合颗粒和气溶胶在自然或工业环境中很常见。利用遥感或自然环境中的原位主动光学仪器,用精确的方法分析它们的散射和吸收特性,可能有助于获得有关真实颗粒的信息。过去曾开发过许多复杂程度不同的方法。对于球体聚集体,Mackowski 和 Mishchenko(2011 年)最新版本的 T-Matrix 方法几乎可以精确地处理问题,并能得出散射特性的所有细节。然而,由于计算原因,T-矩阵法无法处理大颗粒。为了处理大颗粒,Botet 等人(1997 年)为相同球体的聚集体开发了均场版 T-Matrix 理论,并特别用于分析土卫六烟雾的情况。这种平均场 T-Matrix 方法可以有效地快速计算米氏球聚集体的许多光学特性的精确近似值,但它本身受到平均场近似值的限制。它使用了对相关函数的粗略近似(Seignovert 等人,2017 年),并导致几何光学极限下的不准确估计(Tazaki 和 Tanaka,2018 年)。在本研究中,我们对这两个局限性进行了改进。这大大增加了该方法的有效范围及其准确性。为了评估新版平均场法(MFT-M+)的性能,我们将其与 T-Matrix 方法的结果进行了比较。
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来源期刊
Icarus
Icarus 地学天文-天文与天体物理
CiteScore
6.30
自引率
18.80%
发文量
356
审稿时长
2-4 weeks
期刊介绍: Icarus is devoted to the publication of original contributions in the field of Solar System studies. Manuscripts reporting the results of new research - observational, experimental, or theoretical - concerning the astronomy, geology, meteorology, physics, chemistry, biology, and other scientific aspects of our Solar System or extrasolar systems are welcome. The journal generally does not publish papers devoted exclusively to the Sun, the Earth, celestial mechanics, meteoritics, or astrophysics. Icarus does not publish papers that provide "improved" versions of Bode''s law, or other numerical relations, without a sound physical basis. Icarus does not publish meeting announcements or general notices. Reviews, historical papers, and manuscripts describing spacecraft instrumentation may be considered, but only with prior approval of the editor. An entire issue of the journal is occasionally devoted to a single subject, usually arising from a conference on the same topic. The language of publication is English. American or British usage is accepted, but not a mixture of these.
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