This page describes an image Winter Haloes, by Thomas Gigl, Germany
Image caption:
Second place in the 2021 IAU OAE Astrophotography Contest, category Sun/Moon haloes.
Captured in Jochberg located in the famous Austrian ski-region of Tirol, this image shows multiple features related to ice halos, which are a more common appearance around the sun, due to its brightness, than the moon. External and internal reflection of sun rays from ice crystal faces and within different types of ice crystals lead to these halo related phenomena. The 22° halo encircles the sun, with two bright spots at the edge called Sundogs, Parhelia or Mock Suns observed to the left and right at the same height as the sun. The horizontal white band called the parhelic circle, named after the sun god Helios, passes through the sun and the Sundogs at the same angular elevation. An Upper tangent arc, a suncave parry arc and a lower tangent arc are also seen touching the top and bottom of the 22° halo. An upside down rainbow like arc or the circumzenithal arc is seen touching the bright supralateral arc, both of which are less frequently observed.
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Image credit:
Thomas Gigl/IAU OAE
DOI: 10.5281/zenodo.5418795
Related glossary terms:
Halo
, Sun
Categories:
Naked Eye Astronomy
, The Sun
Image license: Creative Commons Attribution 4.0 International (CC BY 4.0) Creative Commons Attribution 4.0 International (CC BY 4.0) icons
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Captions in Different Languages:
Image caption: Deuxième place au concours d'astrophotographie 2021 de l'UAI OAE, catégorie halos Soleil/Lune.
Photographiée à Jochberg, dans la célèbre région de ski autrichienne du Tyrol, cette image montre de multiples caractéristiques liées aux halos de glace, qui sont plus fréquents autour du Soleil, en raison de sa luminosité, qu'autour de la Lune. La réflexion externe et interne des rayons solaires sur les faces des cristaux de glace et à l'intérieur des différents types de cristaux de glace entraîne ces phénomènes liés aux halos. Le halo de 22° entoure le Soleil, avec deux points lumineux en bordure appelés Sundogs, Parhelia ou Mock Suns observés à gauche et à droite à la même hauteur que le Soleil. La bande blanche horizontale appelée cercle parhélique, du nom du dieu du Soleil Hélios, passe par le Soleil et les Sundogs à la même élévation angulaire. Un arc tangent supérieur, un arc de parade en forme d'enclume et un arc tangent inférieur sont aussi vus touchant également le haut et le bas du halo de 22°. Un arc de type arc-en-ciel inversé ou l'arc circumzénithal est vu touchant l'arc supralatéral brillant, les deux étant moins fréquemment observés.
Image credit: Thomas Gigl/IAU OAE
Related glossary terms: Halo , Soleil Caption translation status: Not yet approved by a reviewer
Caption translators: Rulx Narcisse
Image caption: Secondo posto al concorso di astrofotografia IAU OAE 2021, categoria Aloni di Sole/Luna.
Catturata a Jochberg, nella famosa regione sciistica austriaca del Tirolo, questa immagine mostra molteplici esempi di aloni prodotti dal ghiaccio, appaiono più comunemente intorno al Sole, a causa della sua luminosità, rispetto alla Luna. La riflessione esterna e interna dei raggi solari sulle facce dei cristalli di ghiaccio e tra diversi tipi di cristalli di ghiaccio porta a queste strutture degli aloni. L'alone a 22° circonda il Sole, con due punti luminosi sul bordo chiamati Sundogs, Pareli o Soli fittizi, osservati a sinistra e a destra alla stessa altezza del Sole. La banda bianca orizzontale chiamata cerchio parelico, da Elio, nome greco del dio del sole, passa attraverso il Sole e i pareli alla stessa elevazione angolare. Si vedono anche un arco di tangente superiore, un arco di Parry, concavo relativamente al Sole, e un arco di tangente inferiore che toccano la parte superiore e inferiore dell'alone di 22°. Un arco rovesciato simile all'arcobaleno o all'arco circumzenitale sembrano toccare l'arco luminoso sopra-laterale, entrambi osservati meno frequentemente.
Image credit: Thomas Gigl/IAU OAE
Related glossary terms: L'alone , Sole Caption translation status: Approved by a reviewer
Caption translators: Giuliana Giobbi, Francesco Salvestrini
Caption reviewers: Silvia Casu, Rodolfo Canestrari
