![]() ![]() It is a common halo that is usually less bright than the 22° halo. It is circular in shape and has a radius of 46°. If the thumb is seen over the sun then the 22° halo will be found near the tip of the little finger. We can get to know about the radius if we use our hand and we see if the approximate angle between the thumb and little finger, with an outstretched finger and arms spread, is 20°. On some days, the complete circle may be visible depending on the amount of cirriform cloud. It always has a 22° radius and it is also known as the Sun Halo effect or Sun Halo. The part of the sky which is in the ring is quite darker than the whole of the sky. It has a red border on the inside and sometimes it shows a violet border on the outside. It is white in colour and there is a white luminous ring of 22° around the sun and moon which is situated in the centre. The small halo is known as the 22° halo and it is often observed. We Have Read What is a Halo and Its Various Types are Mentioned below: 22° Halo "Ice crystals lead to the formation of a halo of light because of reflection or refraction or combination of both the effects." - General definition. ![]() We Can Define Halo in the Following Ways:Īccording to the World Meteorological Organisation, " A group of optical phenomena in the form of rings, arcs, pillars or bright spots, produced by the refraction or reflection of light by ice crystals suspended in the atmosphere (cirriform clouds, diamond dust, etc.)." 22° halo is considered as the most common one whereas tangent arc, sun pillars, parhelia, etc are considered as those which occurred less frequently and others occur with respect to reflection as well as refraction of light of the crystals of the Sun and the Moon. Various kinds of halo can occur in the atmosphere. The refraction phenomena lead to the separation of colours whereas the reflection is said to be whitish in colour due to the incident light which is not broken up into component colours. It can occur because of the combination of both the effects. It occurred because either because of the refraction of light which passes from these ice crystals or due to the reflection of light from these crystal faces. Halo is a kind of optical atmospheric phenomenon which occurs in the sky when the Sun or the Moon shines in the thin clouds which are composed of ice crystals. We will cover what is halo, its definition and various types of halo light phenomena. In this article, we will learn about the halo atmospheric phenomenon. It can be formed in various forms among which the circular type phenomenon is the most common. It occurred in the sky because of the ice crystals present in the clouds and due to the reflection or refraction of light through these crystals. At different locations and at different times, this phenomenon has been observed by people. It is one of the beautiful phenomena of the atmosphere that is worth observing. The Halo phenomenon is said to be a rare phenomenon but not an unheard one. ![]()
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