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Fabrication of High Contrast Gratings for the Spectrum Splitting Dispersive Element in a Concentrated Photovoltaic System

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Can cirrus clouds produce glories?

K Sassen, W P Arnott, J M Barnett

|February 13, 2008

Summary

A rare glory display was observed over Utah, suggesting ice particles between 9-15 µm. The study indicates these particles may be slightly aspherical, impacting the glory

Area of Science:

Atmospheric Optics
Cloud Physics

Background:

Glory displays are optical phenomena caused by light backscattering from spherical water droplets.
Observations of glories are rare, especially those providing data on particle size and shape.
Cirrus clouds, composed of ice crystals, can exhibit unique optical phenomena.

Purpose of the Study:

To analyze a photographed glory display observed over central Utah.
To determine the size and shape characteristics of cloud particles responsible for the glory.
To investigate the influence of particle shape on glory appearance and colorization.

Main Methods:

Photographic analysis of a glory display captured from an airplane.
Mie and approximate nonspherical scattering simulations.

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Estimation of cloud top temperature and glory ring radius.

Main Results:

A single reddish-brown glory ring (2.5-3.0 degrees radius) was identified.
Scattering simulations predicted particle modal diameters between 9 and 15 µm.
The poor colorization suggests the presence of slightly aspherical ice particles.

Conclusions:

Multiple-ringed glories require strictly spherical particles for accurate backscattering.
Observed glory characteristics suggest slightly aspherical ice particles, possibly from an orographic wave cloud.
The formation of these particles may involve gradual crystalline growth from frozen cloud droplets.