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Atmospheric Optics
Houses information about rays and shadows, water droplets, rainbows, ice halos, and high atmosphere. With links and resources.
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Bob Fosbury: Atmospheric ice halos
Compares personal photographs of ice halos with computer model simulations to show the different arcs and bands.
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Finnish Halo Observing Network
Details the hard core scientific research on halos on an amateur basis. With diagrams, drawings, and photographs.
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Hyperphysics: Atmospheric Optics
Presents photographs, diagrams, and explanations of the physics behind phenomena such as rainbows, sky color, coronas, and mirages.
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Optics of the Atmosphere
Offers photographs and explanations for rainbows, halos, noctilucent clouds, and diffraction phenomena.
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University of Illinois at Urbana-Champaign: Light and Optics
Presents photographs, illustrations, and descriptions of how rays, pillars, halos, and rainbows are created.
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Weatherscapes.com: Atmospheric optics
Extensive photographic gallery of effects caused by ice crystals and water droplets, at sunrise, sunset, and twilight, and other refraction, reflection, and diffraction examples.