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Collection and Identification of Pollen from Honey Bee Colonies

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Published on: January 19, 2021

Vertical elliptical coronas caused by pollen.

P Parviainen, C F Bohren, V Mäkelä

|October 12, 2010

Summary

This summary is machine-generated.

Researchers propose that unusual elliptical coronas observed in cloudless skies may be caused by scattering of light by pollen grains, not just cloud droplets.

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Area of Science:

Atmospheric optics
Light scattering phenomena
Aerosol science

Background:

Coronas, colored rings around celestial bodies, are typically caused by near-forward scattering from spherical cloud droplets.
Amateur astronomers have observed vertically elliptical coronas in cloudless skies, with aspect ratios varying with solar/lunar altitude.
Brightening within these unusual coronas has also been reported.

Purpose of the Study:

To investigate the potential role of airborne pollen grains in forming observed elliptical coronas.
To explain the deviation from circular coronas typically associated with spherical cloud droplets.

Main Methods:

Analysis of light scattering by spheroidal particles using Fraunhofer theory.
Theoretical modeling of light scattering by pollen grains of varying shapes (spheroidal, and more complex).

Main Results:

Fraunhofer theory provides analytical expressions for scattering by spheroidal grains.
The study proposes birch pollen grains (spheroidal) as a potential cause for some observed coronas.
More complex pollen shapes (pine, spruce) may explain other observed phenomena, requiring further investigation.

Conclusions:

Airborne pollen grains, particularly birch pollen, can potentially explain the formation of elliptical coronas observed in cloudless skies.
The shape of pollen grains significantly influences the resulting optical phenomena, deviating from the circular patterns produced by spherical cloud droplets.
Further research involving numerical simulations or laboratory experiments is needed to fully understand the optical effects of complex-shaped pollen grains.