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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Liljequist parhelion ： ウィキペディア英語版 Liljequist parhelion A Liljequist parhelion is a rare halo, an optical phenomenon in the form of a brightened spot on the parhelic circle approximately 150–160° from the sun; i.e., between the position of the 120° parhelion and the anthelion. While the sun touches the horizon, a Liljequist parhelion is located approximately 160° from the sun and is about 10° long. As the sun rises up to 30° the phenomenon gradually moves towards 150°, and as the sun reaches over 30° the optical effect vanishes. The parhelia are caused by light rays passing through oriented plate crystals. Like the 120° parhelia, the Liljequist parhelia display a white-bluish colour. This colour is, however, associated with the parhelic circle itself, not the ice crystals causing the Liljequist parhelia. The phenomenon was first observed by Gösta Hjalmar Liljequist in 1951 at Maudheim, Antarctica during the Norwegian–British–Swedish Antarctic Expedition in 1949–1952. It was then simulated by Dr. Eberhard Tränkle (1937–1997) and Robert Greenler in 1987 and theoretically explained by Walter Tape in 1994.〔 A theoretical and experimental investigation of the Liljequist parhelion caused by perfect hexagonal plate crystals showed that the azimuthal position of maximum intensity occurs at $\backslash theta\_1\}=2\backslash arccos\backslash left(n\backslash sin\backslash left(\backslash frac\; -\; \backslash alpha\_\backslash right)\backslash right)$, where the refractive index $n$ to use for the angle $\backslash alpha\_=\backslash arcsin(1/n)$ of total internal reflection is Bravais' index for inclined rays, i.e. $n(e)=\backslash sqrt/\backslash cos\backslash left(e\backslash right)$ for a solar elevation $e$. For ice at zero solar elevation this angle is $\backslash theta\_1\}\backslash approx\; 153^$. The dispersion of ice causes a variation of this angle, leading to a blueish/cyan coloring close to this azimuthal coordinate. The halo ends towards the anthelion at an angle $\backslash theta\_2\}^$ $\backslash theta\_2\}^=\backslash frac\; +\; \backslash arcsin\backslash left(n\backslash sin\backslash left(\backslash frac-\backslash alpha\_\backslash right)\backslash right)$. == References == 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Liljequist parhelion」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.