Light scattering by nonspherical ice grains - An application to noctilucent cloud particles

Details Light scattering by nonspherical ice grains - An application to noctilucent cloud particles Light scattering by nonspherical ice grains - An application to noctilucent cloud particles

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992em%26p...57..203m&link_type=abstract

Earth, Moon, and Planets (ISSN 0167-9295), vol. 57, no. 3, June 1992, p. 203-211.

Computer Science

13

Ice, Light Scattering, Linear Polarization, Noctilucent Clouds, Spheroids, Grain Size, Refractivity, Scattering Cross Sections

Scientific paper

A rigorous use is presently made of light-scattering theory to randomly oriented nonspherical particles, in order to estimate the degree of linear polarization of the scattered light for ice grains of different shape. A comparison of calculation results with rocket polarization measurements of noctilucent clouds indicates that while slightly flattened and elongated grains have an upper-limit of particle equal-volume radii of about 0.12 micron, similar to spherical particles, platelike and needlelike particles' upper limit is of the order of 0.18-0.20 micron. Spheroids are also noted to have slightly smaller scattering cross sections per unit particle mass than equal-volume spherical grains.

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