Sundogs and halo

Sundogs and halo

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Credit: FRANK ZULLO/SCIENCE PHOTO LIBRARY

Caption: Sundogs and halo. Saguaro cactus (Carnegiea gigantea) silhouetted against a solar halo at sunset. The sundogs, or parhelia, are the colourful patches of light at the left and right of the sun (centre). They are situated along the path of a partial 22 degrees solar halo. These optical phenomena are part of a halo formation caused by the refraction of sunlight by ice crystals that make up cirrostratus clouds. Saguaro cacti are native to the deserts in Arizona. Photographed in the desert, north Scottsdale, Arizona, USA.

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Keywords: 22 degree halo, 22 degrees, american, arizona, atmospheric effect, cactus, carnegiea gigantea, cirrostratus cloud, climate, cloud, clouds, desert, dusk, effects, evening, geographical, geography, halo, ice crystals, light, maricopa county, meteorological, meteorology, natural, north america, north american, north scottsdale, optical phenomenon, parhelia, parhelion, partial halo, phenomena, plant, refracted, refraction, saguaro, saguaro cactus, silhouette, silhouetted, sky, solar halo, sun, sun's light, sundog, sunlight, sunset, twilight, united states, us, usa, weather

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