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Statistical approach to light scattering by convex ice crystals.
Anatoli Borovoi1, Natalia Kustova
1Institute of Atmospheric Optics, Russian Academy of Science, Russia. borovoi@iao.ru
Optics Letters
|May 12, 2006
Summary
This study reveals that light scattering by ice crystals depends mainly on single internal collisions. Specific parameters describing light distribution characterize hexagonal ice crystal shapes.
Area of Science:
- Atmospheric optics
- Light scattering by ice crystals
Background:
- Ice crystals in the atmosphere scatter light, influencing climate and visibility.
- Understanding light-ice crystal interactions is crucial for atmospheric modeling.
Purpose of the Study:
- To calculate phase functions for randomly oriented ice crystals using geometric optics.
- To determine how crystal shape influences light scattering patterns.
Main Methods:
- Geometric optics approximation applied to light propagation within ice crystals.
- Series expansion based on the multiplicity of internal light collisions.
- Analysis of scattering coefficients and angular functions.
Main Results:
- Scattering coefficients strongly depend on ice crystal shape.
- Angular functions show weak dependence on crystal shape.
- The term for single internal light collisions is dominant in scattering.
Conclusions:
- Three parameters quantifying single-collision scattered light distribution are key for characterizing hexagonal ice crystals.
- These parameters effectively describe scattering into the aureole and 22°/46° halos.