| Added | Fri, 07/10/2016 |
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Halo usually appears around the Sun or moon, sometimes around other powerful light sources such as street lights. There are many types of halos, but they are mostly caused by ice crystals in Cirrus clouds at a height of 5-10 km in the upper troposphere. The form of the observed halo depends on the shape and arrangement of crystals. Reflected and refracted by the ice crystals, the light often turns into a spectrum, which makes halo look like a rainbow, but a halo in low light has a low chroma, which is associated with the peculiarities of twilight vision.
Sometimes in frosty weather, the halo is formed by the crystals is very close to the earth's surface. In this case, the crystals resemble sparkling gemstones.
It is necessary to distinguish halo from crowns. The latter have a smaller angular size (up to 5°), and due to diffractive scattering rays of light in water droplets forming a cloud or fog.
Halo has a diverse number of forms, so it is mistaken for many different phenomena: UFOs, ghosts, new heavenly bodies, living organisms, plasma, etc.
Translated by «Yandex.Translator»
The Parghelia
Morning shooting. It is a small "about the sun" - a type of halo. It looks like a bright rainbow spot on the same level as the Sun.
Occurs due to prelomleniya of light in anisotropic oriented ice crystals floating in the atmosphere.
Shutter speed: 1/800 sec
F-number: 8.0
ISO: 100
Flash: no flash
Translated by «Yandex.Translator»
The Parghelia
In the pictures on the right, on the same line with the Sun. View of the halo. Looks like a light iridescent stain at the Sun. Caused by the refraction of sunlight in an anisotropic oriented ice crystals floating in the atmosphere.
Excerpt: 1/10309 sec
F-number: 2.2
ISO: 40
Flash: no flash
Translated by «Yandex.Translator»
Lunar halo. 06.04.2017 21:32 Voronezh
ISO 3200
Aperture f/3.5
Extract 1/3 C.
Translated by «Yandex.Translator»
If the sky at the same time there were all possible halos and arcs.
a and b, a small halo and the false "sun".
with a big halo. The rays of light in the formation of this halo are basically the same as in the formation of small halos. However, there is one difference. The light beam passes in this case through the dihedral angle between two adjacent side faces of the crystal, equal to 60° (as in the formation of small halos), and an angle between the base and one of the faces, equal to 90°.
And here the most striking of the light beam occurs under the angle at which the output beam is less deviated from the original direction. With proper crystal orientation light, dissipated in this way, and gives a large halo visible under an angle of 46°.
d − okolozemnoi halo. The light rays enter and leave at two adjacent mutually perpendicular faces of the crystal. To the formation of this halo is made possible, the Sun should be below 32° above the horizon.
e − prelicence circle. The light is reflected from the vertical faces of the falling crystals.
f − about "the sun" the big halo. Very rarely observed bright areas are due to the same scattering, and a large halo, but in this case the scattering takes place only on the crystals, the major axes are horizontal.
j − arc Levitra. They are formed when falling a vertical hexagonal ice needles oscillate slightly about a horizontal axis. The light, incoming through one of the faces of the prism, exits through another. The greatest brightness of transmitted light and are observed at an angle corresponding to the least deviation of the rays from the original direction. An arc is formed by the light emanating from crystals that satisfy this requirement.
18 Jul 1794 this phenomenon was observed in St. Petersburg
Translated by «Yandex.Translator»
Many people call this unusual natural phenomenon an inverted rainbow, although in fact this optical phenomenon is one of the phenomena of the halo and is called the "near-zenith arc".
This phenomenon looks like a bright rainbow at the zenith, and is observed when the Sun is no higher than 32 degrees above the horizon. The circumference arc is a partial halo, the size of which is one-fourth of the circumference, in the lower part of which it is located.
Crystallized droplets of moisture, refracting light, create a visual rainbow effect, the optimal observation of which is possible at an angle of about 22 degrees. Most often this unusual phenomenon is observed in regions with a predominance of low temperature.
A rare weather phenomenon called crowns, which are light misty rings in the firmament around the disk of the Sun or Moon.
Ice halo. This effect occurs when sunlight is reflected from ice crystals in the sky
Ryan Hall, Y’all @ryanhallyall
Does anyone know what these light artifacts are?
8:11 PM · Aug 13, 2021
This is a phenomenon they callThe Crown flash. This is a rare optical effect caused by the alignment of ice crystals. Ice crystals are affected by electric fields around the cloud, and they reflect or refract sunlight in different directions. When electric fields change due to lightning or other factors, the ice crystals also change their orientation, creating the appearance of flashing or dancing light.
What Is a Crown Flash?
August 21, 2020
Meteorologist Ari Sarsalari explains something you might see in the sky called a crown flash.
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