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Related Experiment Videos

Simulating coronas in color.

Stanley D Gedzelman1, James A Lock

  • 1Department of Earth and Atmospheric Sciences and the Center for Remote Sensing Science and Technology, City College of New York, New York, New York 10031, USA. stan@scisun.sci.ccny.cuny.edu

Applied Optics
|February 7, 2003
PubMed
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Corona colors and visibility depend on cloud droplet size, distribution width, and optical thickness. Narrower droplet size distributions in wave clouds create the most vivid coronas.

Area of Science:

  • Atmospheric optics
  • Cloud physics

Background:

  • Coronas are optical phenomena caused by light scattering in clouds.
  • Understanding coronas requires knowledge of Mie scattering theory and cloud properties.

Purpose of the Study:

  • To simulate and analyze the color, visibility, and ring structure of coronas.
  • To investigate the influence of droplet size, size distribution, and cloud optical thickness on corona appearance.

Main Methods:

  • Simulations using Mie scattering theory for light by droplets.
  • Modeling clouds of finite optical thickness within a Rayleigh scattering atmosphere.

Main Results:

  • Corona color and ring sequence vary significantly with droplet radius, especially below 6 micrometers.

Related Experiment Videos

  • Narrower droplet size distributions, common in wave clouds, yield brighter, more vivid coronas.
  • Cloud optical depth (tau) affects corona visibility, with optimal color purity between 0.05 <= tau <= 0.5.

    • Conclusions:

    • Droplet size, distribution width, and cloud optical thickness are key determinants of corona characteristics.
    • Wave clouds produce superior coronas due to their narrow droplet size distributions.
    • Cloud optical depth critically influences corona visibility and color intensity.