Thessaloniki: Moonlight – How it is created – Photos
The basic condition is the existence of ice crystals – The clouds that can cause the phenomenon located at a height of more than 6,000m.
The moon is covered by a bright halo creating an impressive image. No, we are not being visited by aliens, but it is the Lunar Moon.
In Meteorology, Alos is called the optical phenomenon caused by the refraction and reflection of sunlight or moonlight on the ice crystals of the clouds. two types of halos are found, the solar and the lunar. Because the basic condition is the existence of ice crystals, the clouds that can cause this phenomenon are at a height above 6,000m. Such clouds are the so-called upper or cirrostratus.
With the term “halo” many imperfect phenomena are observed, but the main image of the halo is that observed as a great circle at a distance (radius) of 22° to 46° from the center of the source (Sun or Moon). In the first case the circle is white in color, but when the phenomenon is intense the inside is red with various colored bands (orange, yellow and rarely green) towards the inside. A blue external halo is also very rarely observed.
The part of the sky enclosed by the other is always more weakly illuminated than the rest of the area. In the case of the 46° radius, the above colorings are strongly distinguishable. But usually this halo is not visible in its entirety, but only part of it above the horizon. In rare cases it is 90° apart, in which case two arcs are observed.
However, depending on the position of the Sun or the Moon, the halo phenomenon can be accompanied by other related phenomena such as columns, luminous cross, perizenith arc, etc.
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