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Updated: Mar 19, 2026
11:16
Discovering Protein Interactions and Characterizing Protein Function Using HaloTag Technology
Published on: July 12, 2014
37.7K
Summary
Brilliant ice crystal halos are possible but require specific conditions. Factors like ice particle shape, orientation, and cloud properties limit halo brightness, with optimal displays occurring in thin ice fogs.
Area of Science:
- Atmospheric optics
- Optical phenomena
- Crystallography
Background:
- Ice crystal halos are visually striking atmospheric optical phenomena.
- Their potential brilliance is often limited by various environmental and physical factors.
Purpose of the Study:
- To assess the potential brilliance of ice crystal halos.
- To identify and analyze the factors that limit halo formation and intensity.
Main Methods:
- Utilized Monte Carlo models to simulate light scattering by ice crystals.
- Investigated the impact of ice particle characteristics (shape, orientation) and atmospheric conditions (cloud optical depth, background skylight).
Main Results:
- Halo brilliance can significantly exceed background skylight but requires near-perfect ice crystals with minimal tilt.
- Suboptimal ice particle shapes ('junk' ice), dimensions, and orientations reduce brilliance.
- Optimal cloud optical depth for halos is around 10^-1; thicker clouds increase 'junk' ice.
- Spectacular displays are most likely in optically thin, surface-level ice fogs.
Conclusions:
- Brilliant halo displays necessitate stringent conditions, including a high fraction of perfectly formed ice crystals falling with minimal tilt.
- The interplay between ice crystal properties and atmospheric conditions critically determines halo intensity.
- Simulations confirm the precise environmental requirements for observing brilliant halos, as exemplified by the 1999 South Pole display.
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