About: 46° halo

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A 46° halo is a rare atmospheric optical phenomenon that consists of a halo with an apparent radius of approximately 46° around the Sun. At solar elevations of 15–27°, 46° halos are often confused with the less rare and more colourful supralateral and infralateral arcs, which cross the parhelic circle at about 46° to the left and right of the sun.

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  • A 46° halo is a rare atmospheric optical phenomenon that consists of a halo with an apparent radius of approximately 46° around the Sun. At solar elevations of 15–27°, 46° halos are often confused with the less rare and more colourful supralateral and infralateral arcs, which cross the parhelic circle at about 46° to the left and right of the sun. The 46° halo is similar to, but much larger and fainter than, the more common 22° halo. The 46° halo forms when sunlight enters randomly oriented hexagonal ice crystals through a prism face and exits through a hexagonal base.The 90° inclination between the two faces of the crystals causes the colours of the 46° halo to be more widely dispersed than those of the 22° halo. In addition, as many rays are deflected at larger angles than the angle of minimum deviation, the outer edge of the halo is more diffuse. To tell the difference between a 46° halo and the infralateral or supralateral arcs, one should carefully observe sun elevation and the fluctuating shapes and orientations of the arcs. The supralateral arc always touches the circumzenithal arc, while the 46° halo only achieves this when the sun is located 15–27° over the horizon, leaving a gap between the two at other elevations. In contrast, supralateral arcs cannot form when the Sun is over 32°, so a halo in the region of 46° is always a 46° halo at higher elevations. If the Sun is near the zenith, however, circumhorizontal or infralateral arcs are located 46° under the Sun and can be confused with the 46° halo. (en)
  • Le grand halo, également appelé halo de 46°, est un photométéore rare qui se produit autour du Soleil ou de la Lune. Il est causé par la double réfraction de la lumière provenant de ces sources et passant à travers une mince couche de cristaux de glace, comme ceux d'un cirrus. Il prend la forme d'un anneau circulaire d'ouverture de 46° avec l'axe qui relie la source et l'observateur, et l'intensité de ce halo est beaucoup plus faible que celui du petit halo. Le grand halo est souvent confondu avec l’arc supralatéral et l’arc infralatéral. Ces derniers sont des arcs convexes qui peuvent être tangents localement au grand halo, qui lui est concave, au-dessus ou en dessous du cercle parhélique. (fr)
  • De 46°-halo of grote kring is een zeldzaam type halo in de vorm van een ring rond de zon of maan met een straal van ongeveer 46 booggraden. De naam grote kring is ter onderscheiding van de veel frequentere kleine kring of 22°-halo. (nl)
  • Halo 46° – zjawisko optyczne występujące w atmosferze ziemskiej, jest to halo występujące wokół słońca lub księżyca w postaci słabego jasnego, ale wyraźnie zabarwionego okręgu wokół źródła światła o promieniu kątowym 46°. Łuk jest czerwony od wewnątrz, zawiera pastelowe kolory. (pl)
  • Um halo de 46° é um halo ótico e raro centralizado no Sol. Em elevações solares entre 15 e 27°, às vezes é confundido com o mais e que são mais frequentemente observados. Seu nome é por cruzar o círculo parélico em 46° a partir do Sol. Os halos de 46° são similares a, porém maiores e mais fracos que, os que são comuns. Ambos são formados quando a luz do sol entra em cristais de gelos hexagonais randomicamente orientados através de uma face prismática e saem em uma base hexagonal.A inclinação de 90° entre as duas faces dos cristais faz as cores do halo de 46° serem mais dispersas que o de 22°. Além disso, como muito mais raios são defletidos em ângulos maiores que o ângulo de desvio mínimo, as bordas exteriores do halo são mais difusas. Para perceber a diferença entre o halo de 46° e os arcos infra e supraletarais, deve-se observar atentamente a elevação do Sol e as formas flutuantes e orientação dos arcos. Os arcos supralaterais sempre tocam o arco circunzenital, enquanto o halo de 46° apenas consegue quando o Sol está localizado entre 15° e 27° sobre o horizonte, deixando um espaço entre as duas outras elevações. Por outro lado, arcos supralaterais não podem se formar quando o Sol está acima de 32°, portanto um halo na região de 46° sempre é um halo de 46° em elevações superiores. Todavia, se o Sol está próximo ao zênite arcos circumhorizontais ou infralaterais estão localizados abaixo de 46° em relação ao Sol e podem ser confundidos com o halo de 46°. (pt)
  • 46度暈是一種很罕見的出現在太陽附近的暈。當太陽與水平線的夾角呈15-27°時,46度暈很容易與上側弧與混淆。 46度暈與22度暈相似,但更寬更淡。成因是陽光穿過六角形冰晶時, 晶體之間90°的夾角使得其色彩分佈比22度暈更為分散。 (zh)
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  • De 46°-halo of grote kring is een zeldzaam type halo in de vorm van een ring rond de zon of maan met een straal van ongeveer 46 booggraden. De naam grote kring is ter onderscheiding van de veel frequentere kleine kring of 22°-halo. (nl)
  • Halo 46° – zjawisko optyczne występujące w atmosferze ziemskiej, jest to halo występujące wokół słońca lub księżyca w postaci słabego jasnego, ale wyraźnie zabarwionego okręgu wokół źródła światła o promieniu kątowym 46°. Łuk jest czerwony od wewnątrz, zawiera pastelowe kolory. (pl)
  • 46度暈是一種很罕見的出現在太陽附近的暈。當太陽與水平線的夾角呈15-27°時,46度暈很容易與上側弧與混淆。 46度暈與22度暈相似,但更寬更淡。成因是陽光穿過六角形冰晶時, 晶體之間90°的夾角使得其色彩分佈比22度暈更為分散。 (zh)
  • A 46° halo is a rare atmospheric optical phenomenon that consists of a halo with an apparent radius of approximately 46° around the Sun. At solar elevations of 15–27°, 46° halos are often confused with the less rare and more colourful supralateral and infralateral arcs, which cross the parhelic circle at about 46° to the left and right of the sun. (en)
  • Le grand halo, également appelé halo de 46°, est un photométéore rare qui se produit autour du Soleil ou de la Lune. Il est causé par la double réfraction de la lumière provenant de ces sources et passant à travers une mince couche de cristaux de glace, comme ceux d'un cirrus. Il prend la forme d'un anneau circulaire d'ouverture de 46° avec l'axe qui relie la source et l'observateur, et l'intensité de ce halo est beaucoup plus faible que celui du petit halo. (fr)
  • Um halo de 46° é um halo ótico e raro centralizado no Sol. Em elevações solares entre 15 e 27°, às vezes é confundido com o mais e que são mais frequentemente observados. Seu nome é por cruzar o círculo parélico em 46° a partir do Sol. (pt)
rdfs:label
  • 46° halo (en)
  • Halo de 46° (fr)
  • 46°-halo (nl)
  • Halo 46° (pl)
  • Halo de 46° (pt)
  • 46度暈 (zh)
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