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Simulation and analysis of pollen coronas.

E Tränkle, B Mielke

|October 12, 2010

Summary

Numerical simulations of light scattering by birch and pine pollen grains reveal coronas with vertical elliptical shapes. These findings align with observations of pollen coronas, particularly with vertically oriented pollen axes.

Area of Science:

Atmospheric optics
Light scattering physics
Biophysics of pollen

Background:

Pollen grains, such as birch and pine, can create optical phenomena like coronas when illuminated by sunlight.
Understanding these phenomena requires detailed modeling of light-matter interactions with complex particle shapes.

Purpose of the Study:

To numerically simulate light scattering by birch and pine pollen grains.
To investigate the formation of coronas and their characteristics.
To analyze the sensitivity of these optical patterns to various parameters.

Main Methods:

Modeling pollen grain shapes as unions of ellipsoids.
Solving the Fraunhofer integral using the fast Hartley transform for light scattering calculations.
Comparing simulation results with observational data.

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Main Results:

Generated color plates of coronas exhibiting vertical elliptical shapes and strong brightenings.
Demonstrated sensitivity of corona patterns to pollen orientation, Sun elevation, pollen shape, and size.
Achieved good agreement between simulated and observed coronas, especially for vertically oriented pollen.

Conclusions:

Numerical simulations accurately reproduce observed pollen coronas.
Pollen orientation, particularly vertical alignment, significantly influences corona characteristics.
The study validates the use of numerical simulations for understanding atmospheric optical phenomena caused by aerosols.