Publication Abstracts

Mishchenko 2015

Mishchenko, M.I., 2015: Measurement and modeling of electromagnetic scattering by particles and particle groups. In Polarimetry of Stars and Planetary Systems. L. Kolokova, J. Hough, and A.-C. Levasseur-Regourd, Eds. Cambridge University Press, pp. 13-34, doi:10.1017/CBO9781107358249.003.

Small particles forming clouds of interstellar and circumstellar dust, regolith surfaces of many solar system bodies, and cometary atmospheres have a strong and often controlling effect on many ambient physical and chemical processes. Similarly, aerosol and cloud particles exert a strong influence on the regional and global climates of the Earth, other planets of the solar system, and exoplanets. Therefore, detailed and accurate knowledge of physical and chemical characteristics of such particles has the utmost scientific importance.

More often than not, it is impossible to collect samples of such particles and subject them to controlled physical and chemical laboratory tests. Instead, the astrophysicist usually has to rely on a theoretical analysis of remote observations of the electromagnetic radiation scattered or directly transmitted by the particles. In some cases, remote-sensing studies can be supplemented by in situ measurements of electromagnetic scattering. It has been established in numerous investigations that the scattering and absorption properties of small particles can exhibit a strong dependence on their size, morphology, orientation, and refractive index. These dependencies make measurements of electromagnetic scattering and their theoretical analysis an extremely useful and sometimes the only practical means of physical and chemical particle characterization in astrophysics.

The majority of remote-sensing studies have tradition- ally relied on measurements of only the scattered intensity and its spectral dependence. However, it is now widely recognized that polarimetric characteristics of the scattered radiation can contain much more reliable and specific information on such important properties of particles as their size, morphology, and chemical composition. A classical textbook example is the use of ground-based polarimetry to discover micrometer-sized sulfuric acid droplets in the atmosphere of Venus. This discovery was facilitated by the spherical shape of the droplets as well as by the large optical thickness of Venusian clouds and their vertical and spatial uniformity during the period of observations.

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BibTeX Citation

@inbook{mi04120g,
  author={Mishchenko, M. I.},
  editor={Kolokova, L. and Hough, J. and Levasseur-Regourd, A.-C.},
  title={Measurement and modeling of electromagnetic scattering by particles and particle groups},
  booktitle={Polarimetry of Stars and Planetary Systems},
  year={2015},
  pages={13--34},
  publisher={Cambridge University Press},
  address={London},
  doi={10.1017/CBO9781107358249.003},
}

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RIS Citation

TY  - CHAP
ID  - mi04120g
AU  - Mishchenko, M. I.
ED  - Kolokova, L.
ED  - Hough, J.
ED  - Levasseur-Regourd, A.-C.
PY  - 2015
TI  - Measurement and modeling of electromagnetic scattering by particles and particle groups
BT  - Polarimetry of Stars and Planetary Systems
SP  - 13
EP  - 34
DO  - 10.1017/CBO9781107358249.003
PB  - Cambridge University Press
CY  - London
ER  -

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