An anthelion (plural anthelia, from late Greek ανθηλιος, "opposite the sun") is a rare optical phenomenon appearing on the parhelic circle opposite to the sun as a faint white halo, not unlike a sundog. Greek (el ελληνική γλώσσα or simply el ελληνικά — "Hellenic" is an Indo-European language, spoken today by 15-22 million people mainly An optical phenomenon is any observable event which results from the interaction of Light and Matter. A parhelic circle is a halo, an Optical phenomenon appearing as a horizontal white line on the same altitude as the Sun, or occasionally the Moon The Sun (Sol is the Star at the center of the Solar System. A halo (ἅλως also known as a nimbus, icebow or Gloriole) is an Optical phenomenon that appears near or around the Sun or A sun dog or sundog (scientific name parhelion, plural parhelia, for "beside the sun" is a common bright circular spot on a solar
How anthelions are formed is disputed. Walter Tape, among others, has argued they are not separate haloes, but simply where various haloes caused by horizontally oriented column-shaped ice crystals coincide on the parhelic circle to create a bright spot. Ice crystals - small crystalline form of Ice including hexagonal columns hexagonal plates dendritic crystals and Diamond dust. If this theory is correct, anthelia should only appear together with these other haloes. [1]
However, anthelia occurs unaccompanied by other plate crystal haloes, why other scientists have produced alternative explanations. The Dutch professor S. W. Visser proposed they form by two exterior light reflections in quadrangular prisms, while Robert Greenler has suggested two interior reflection in column-shaped crystals produces the phenomenon. [1]
While the anthelion area is usually sparse on haloes, in a complex display it features various rare optic phenomena: Flanking the anthelion on the parhelic circle are two 120° parhelia (and two Liljequist parhelia) caused by plate crystals. A Liljequist parhelion is a rare halo, an Optical phenomenon appearing on the Parhelic circle approximately ±150-160° from the Sun between The Tricker and diffuse arcs are produced in singly oriented column crystals and form a Ankh-like shape passing through the anthelion. Ankylosis progressive homolog (mouse, also known as ANKH, is a human Gene. Wegener arcs occasionally crosses the sky to converge in the anthelion. [2]
See also
References
- ^ a b Anthelion (English). The antisolar point is the imaginary point on the Celestial sphere exactly opposite the Sun. A glory is an optical phenomenon appearing much like an iconic Saint 's halo about the head of the observer which is produced by light Backscattered (a combination A Liljequist parhelion is a rare halo, an Optical phenomenon appearing on the Parhelic circle approximately ±150-160° from the Sun between An optical phenomenon is any observable event which results from the interaction of Light and Matter. A sun dog or sundog (scientific name parhelion, plural parhelia, for "beside the sun" is a common bright circular spot on a solar A rainbow is an optical and meteorological phenomenon that causes a spectrum of Light to appear in the Sky when the Sun The subparhelic circle is a rare halo, an Optical phenomenon located below the Horizon. Arbeitskreis Meteore e. V. . Retrieved on 2007-04-22. Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Events 1500 - Portuguese Navigator Pedro Álvares Cabral becomes the first European to sight Brazil.
- ^ Les Cowley. South Pole Halos - Anthelic View. Atmospheric Optics. Retrieved on 2007-04-22. Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Events 1500 - Portuguese Navigator Pedro Álvares Cabral becomes the first European to sight Brazil. (including fish eye photo a. o. )
External links
- Earth Science Picture of the Day, April 26, 2006 - Photo of an anthelion and anthelic arcs display in Germany February 2006.
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