An anthelion (plural anthelia, from late Greek ανθηλιος, "opposite the sun") is a rare optical phenomenon of the halo family. It appears on the parhelic circle opposite to the Sun as a faint white spot, not unlike a sundog, and may be crossed by an X-shaped pair of diffuse arcs.
How anthelia 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. If this theory is correct, anthelia should only appear together with these other haloes.[1]
However, anthelia occur unaccompanied by other plate crystal haloes, thus 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 reflections 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. The Tricker and diffuse arcs are produced in singly oriented column crystals and form an ankh-like shape passing through the anthelion. Wegener arcs occasionally cross the sky to converge in the anthelion.[2]
anthelion, taiwanese, band, band, this, article, technical, most, readers, understand, please, help, improve, make, understandable, experts, without, removing, technical, details, june, 2023, learn, when, remove, this, template, message, anthelion, plural, ant. For the Taiwanese band see Anthelion band This article may be too technical for most readers to understand Please help improve it to make it understandable to non experts without removing the technical details June 2023 Learn how and when to remove this template message An anthelion plural anthelia from late Greek an8hlios opposite the sun is a rare optical phenomenon of the halo family It appears on the parhelic circle opposite to the Sun as a faint white spot not unlike a sundog and may be crossed by an X shaped pair of diffuse arcs Anthelion bottom and 120 parhelion top depicted in Vadersolstavlan How anthelia 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 If this theory is correct anthelia should only appear together with these other haloes 1 However anthelia occur unaccompanied by other plate crystal haloes thus 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 reflections 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 The Tricker and diffuse arcs are produced in singly oriented column crystals and form an ankh like shape passing through the anthelion Wegener arcs occasionally cross the sky to converge in the anthelion 2 See also EditFalse sunrise Glory RainbowReferences Edit a b Anthelion Arbeitskreis Meteore e V Archived from the original on 2012 05 10 Retrieved 2007 04 22 Les Cowley South Pole Halos Anthelic View Atmospheric Optics Archived from the original on 2015 09 23 Retrieved 2007 04 22 including fish eye photo a o External links EditEarth Science Picture of the Day April 26 2006 Photo of an anthelion and anthelic arcs display in Germany February 2006 This optics related article is a stub You can help Wikipedia by expanding it vte This climatology meteorology related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Anthelion amp oldid 1159003707, wikipedia, wiki, book, books, library,
