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Parhelion

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Parhelion
The scientific name for sun dogs. Either of two colored luminous spots that appear at roughly 22 degrees on both sides of the sun at the same elevation. They are caused by the refraction of sunlight passing through ice crystals.

 


Parhelion or Parhelia (plural) : A bright, colored portion of a solar halo which forms on points 22° either side of the sun and at the same elevation. These luminous spots are caused by the refraction of light by ice crystals.

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The scientific name for sun dogs. Either of two colored luminous spots that appear at roughly 22 degrees on both sides of the sun at the same elevation.

Paraselene A weakly colored lunar halo identical in form and optical origin to the solar parhelion.

It is the nighttime equivalent of a sun dog, or parhelion, caused by the sun in the same manner. The only types of clouds that can form moon dogs are cirrus and cirrostratus clouds.

Sundog
A colored luminous spot produced by refraction of light through ice crystals that appears on either side of the sun. Also called parhelion.

They are most commonly seen during winter in the middle latitudes and are exclusively associated with cirriform clouds. The scientific name for sun dogs is parhelion and they are also known as mock suns.

axis of the plate must oscillate about the vertical by less than 30° to produce the pattern customarily called Lowitz arcs; larger oscillations lead to more complex arcs spreading far above and below the 22° parhelia and halo. See parhelion.

Also called parhelion.supercoolTo cool a liquid below its freezing point without solidification or crystallization.supersaturated airA condition that occurs in the atmosphere when the relative humidity is greater that 100 percent.

Sun Dogsee ParhelionSun PillarA bright column above or below the sun produced by the reflection of sunlight from ice crystals.

See also: Cloud, Clouds, Atmosphere, Water, Surface

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