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A halo (from Ancient Greek ἅλως (hálōs) 'threshing floor, disk') [1] is an optical phenomenon produced by light (typically from the Sun or Moon) interacting with ice crystals suspended in the atmosphere. Halos can have many forms, ranging from colored or white rings to arcs and spots in the sky.
A circumhorizontal arc is an optical phenomenon that belongs to the family of ice halos formed by the refraction of sunlight or moonlight in plate-shaped ice crystals suspended in the atmosphere, typically in actual cirrus or cirrostratus clouds. In its full form, the arc has the appearance of a large, brightly spectrum-coloured band (red being ...
Mars might have sun dogs formed by both water-ice and CO 2-ice. On the giant planets—Jupiter, Saturn, Uranus, and Neptune—other crystals form clouds of ammonia, methane, and other substances that can produce halos with four or more sun dogs. [9] A related phenomenon, the Crown flash is also known as a "leaping Sundog".
To see this ice halo, the sun needs to be more than 58 degrees high in the sky, and high cirrus clouds or jet cont The phenomenon is known technically as a "circumhorizontal arc" and is created by ...
The circumzenithal arc, also called the circumzenith arc (CZA), the upside-down rainbow, and the Bravais arc, [1] is an optical phenomenon similar in appearance to a rainbow, but belonging to the family of halos arising from refraction of sunlight through ice crystals, generally in cirrus or cirrostratus clouds, rather than from raindrops.
A circle of spinning ice was spotted on the Crystal River in Michigan's northern lower peninsula last week. The footage shows the perfect circle of ice slowly spinning in the middle of the river.
The halo was first described by Sir William Edward Parry (1790–1855) in 1820 during one of his Arctic expeditions in search for the Northwest Passage.On April 8, under harsh conditions while his two ships were trapped by ice forcing him to winter over at Melville Island in the northern Canadian Arctic Archipelago, he made a drawing of the phenomenon.
If temperatures during the wintertime vary enough, they can cause a phenomenon known as ice quakes. While earthquakes are a well known natural disaster, a lesser known but equally disturbing ...