File:22-kraadine haloring.JPG
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| Description |
English: A halo(from Greek ἅλως; also known as a nimbus, icebow or gloriole) is an optical phenomenon produced by ice crystals creating colored or white arcs and spots in the sky. Many are near the sun or moon but others are elsewhere and even in the opposite part of the sky. They can also form around artificial lights in very cold weather when ice crystals called diamond dust are floating in the nearby air.
Eesti: Halo ehk halonähtused (vana-kreeka keeles ἅλως – ring, ketas; samuti särapärg, oreool) on valkjad või nõrgalt vikerkaarevärvilised ringikujulised optilised nähtused tugeva valgusallika ümber.
22-kraadine haloring on halonähtus, mis esineb tavaliselt nii Päikese kui Kuu ümber. Selle põhjuseks on jääkristallide kuju - nad on kõige sagedamini kuuetahulised prismakesed. Enamasti on nad õhu turbulentsi tõttu segi paisatud, nii et kristallide välispinnalt peegeldunud valgus hajub enamvähem võrdselt kõigis suundades. Sel viisil segi paisatud prismadesse läbi külgtahu sisenenud valgusest kaldub kõige rohkem kiiri oma esialgsest suunast umbes 22° kõrvale, kusjuures sinine valgus kaldub veidi rohkem kõrvale kui punane. Nii tekibki Päikese ümber 22° kaugusel ring, mille siseserv on punakas ja teravalt piirlitetud, pärast punane läheb sujuvalt üle kollakaks ja rohekaks, lõpuks sinakaks, siis ring kaob. |
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| Source | Own work |
| Author | Signek |
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This is a retouched picture, which means that it has been digitally altered from its original version. Modifications: contrast and brightness.
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This image was uploaded as part of Estonian Science Photo Competition.
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Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 17:21, 15 October 2012 | | 3,264 × 2,448 (3.84 MB) | Signek (talk | contribs) | {{Information |Description ={{en|1=A halo(from Greek ἅλως; also known as a nimbus, icebow or gloriole) is an optical phenomenon produced by ice crystals creating colored or white arcs and spots in the sky. Many are near the sun or moon but othe... |
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