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- Kern_arc abstract "The Kern arc is an extremely rare atmospheric optical phenomenon belonging to the family of ice crystal halos. It is a complete and faint circle around the zenith, in contrast to the related and much more common circumzenithal arc, which is only ever a partial circle.The Kern arc is named after H.F.A. Kern in the Netherlands, who first reported it in 1895. Since then it has been reported on six occasions.It is formed by rays entering the top faces of horizontal plate crystals and leaving through a near vertical side face. Kern arc rays undergo an internal reflection off a side face inclined at 60° to the exit face. Near triangular hexagonal crystals with three alternate side faces much shorter than the others allow the Kern arc to occur.The first photographs of the Kern arc were taken by Marko Mikkilä close to Vuokatti Ski Resort, Sotkamo, Finland on 17 November 2007. The photographs were in natural sunlight taken from an artificial cloud of ice crystals created by snowguns. At the Vuokatti Ski Resort about 100 snowguns may operate at one time. The temperature was −15 to −18 °C in clear sky and almost no wind. Nikon D70 and Nikon FM cameras were used with Sigma 8mm EX F4,Sigma 15mm EX F2.8 lenses. Some samples of ice crystals were also collected, confirming their nearly triangular base.Mikkilä's photographs were first published in Tähdet ja avaruus-magazine 1/2008. The magazine is published by URSA, the Finnish association of astronomy.".
- Kern_arc wikiPageID "15467377".
- Kern_arc wikiPageLength "2386".
- Kern_arc wikiPageOutDegree "11".
- Kern_arc wikiPageRevisionID "683470546".
- Kern_arc wikiPageWikiLink Category:Atmospheric_optical_phenomena.
- Kern_arc wikiPageWikiLink Circumzenithal_arc.
- Kern_arc wikiPageWikiLink Finland.
- Kern_arc wikiPageWikiLink Halo_(optical_phenomenon).
- Kern_arc wikiPageWikiLink Netherlands.
- Kern_arc wikiPageWikiLink Optical_phenomena.
- Kern_arc wikiPageWikiLink Optical_phenomenon.
- Kern_arc wikiPageWikiLink Snowgun.
- Kern_arc wikiPageWikiLink Snowmaking.
- Kern_arc wikiPageWikiLink Sotkamo.
- Kern_arc wikiPageWikiLink Ursa_(Finland).
- Kern_arc wikiPageWikiLinkText "Kern arc".
- Kern_arc hasPhotoCollection Kern_arc.
- Kern_arc wikiPageUsesTemplate Template:Climate-stub.
- Kern_arc wikiPageUsesTemplate Template:Optics-stub.
- Kern_arc wikiPageUsesTemplate Template:Reflist.
- Kern_arc subject Category:Atmospheric_optical_phenomena.
- Kern_arc type Science.
- Kern_arc comment "The Kern arc is an extremely rare atmospheric optical phenomenon belonging to the family of ice crystal halos. It is a complete and faint circle around the zenith, in contrast to the related and much more common circumzenithal arc, which is only ever a partial circle.The Kern arc is named after H.F.A. Kern in the Netherlands, who first reported it in 1895.".
- Kern_arc label "Kern arc".
- Kern_arc sameAs Kernin_kaari.
- Kern_arc sameAs カーンアーク.
- Kern_arc sameAs Łuk_Kerna.
- Kern_arc sameAs m.03mb950.
- Kern_arc sameAs Q3073153.
- Kern_arc sameAs Q3073153.
- Kern_arc wasDerivedFrom Kern_arc?oldid=683470546.
- Kern_arc isPrimaryTopicOf Kern_arc.