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parhelion    
n. 幻日

幻日

parhelion
n 1: a bright spot on the parhelic circle; caused by diffraction
by ice crystals; "two or more parhelia are usually seen at
once" [synonym: {parhelion}, {mock sun}, {sundog}]


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  • Sun dog - Wikipedia
    A sun dog (or sundog) or mock sun, also called a parhelion[1] (plural parhelia) in atmospheric science, is an atmospheric optical phenomenon that consists of a bright spot to one or both sides of the Sun
  • What Is a Sun Dog? - Science Notes and Projects
    In meteorology, a sun dog or parhelion is a bright spot on one or both sides of the Sun Sun dogs or parhelia are around around 22° directly to the left and right of the Sun, sometimes accompanied by a 22° halo around the Sun
  • All About Sundogs - Rainbows beside the Sun! | The Old Farmers Almanac
    The short answer: A sun dog, or parhelion, is a bright patch of light—often rainbow-colored—that appears beside the Sun when sunlight refracts through ice crystals in high clouds
  • PARHELION Definition Meaning - Merriam-Webster
    The meaning of PARHELION is any of several bright spots often tinged with color that often appear on the parhelic circle on either side of the sun—called also sun dog
  • What Is A Sundog - Defining A Parhelion And How It Occurs
    A sundog or parhelion is defined as a bright optical phenomenon occurring near the horizon on the left, right, or both sides of the sun at a 22-degree radius It is a result of sunlight refracted by hexagon-shaped ice crystals in Cirrus clouds with their primary axis vertically orientated
  • Sun dog | Definition Facts | Britannica
    Sun dogs occur when the Sun or Moon shines through a thin cirrus cloud composed of hexagonal ice crystals falling with their principal axes vertical, as opposed to the halo phenomenon that occurs when the principal axes are randomly arranged in a plane perpendicular to the Sun’s or Moon’s rays
  • PARHELION Definition Meaning | Dictionary. com
    The central halo and three bright spots are the result of an optical phenomenon called a sun dog — or parhelion — which occurs when ice crystals in the atmosphere refract sunlight
  • PARHELION | English meaning - Cambridge Dictionary
    Sometimes during the summer we see the parhelion, a similar phenomenon of the sun At each point of contact occurs a parhelion which is a mock sun of brilliant colors and called a sun-dog The parhelia are formed by the reflection of the sunbeams on a cloud properly situated
  • Parhelion - Met Office
    Learn what a Parhelion is and how they form Parhelia are the result of sunlight passing through hexagonal ice crystals contained within cirrus cloud They often appear in conjunction with 22°
  • Parhelions or Sun Dogs - HyperPhysics
    The parhelia often show rainbow colors from the dispersion in the ice crystals While appearing on the 22° halo when the sun is at the horizon, they appear to be slightly outside it at higher altitudes and will flare into a white tail leading away from the 22° halo





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