LINGUAGEM GEOGRÁFICA: ARCO ÍRIS DE FOGO

terça-feira, 1 de julho de 2014

ARCO ÍRIS DE FOGO

O efeito do arco-íris de fogo é criado quando os cristais de gelo minúsculos encontrados no vapor de água de nuvens refletem a luz do sol no ângulo direito e exato.

A visão é rara e fotografada apenas algumas vezes.

$wefuckinglovescience: 'Fire rainbows'. The rainbow effect is created when tiny ice crystals in the water vapour of clouds reflect the sunlight at the exact right angle. The sight is rare and has only ever been photographed a couple of times. Images: (L) Ken Rotberg (R) UC Santa Barbara Geography, via ScienceAlert. These are beautiful. Fire rainbows are neither made of fire, nor are they a rainbow (discuss). They are caused by light refracting through hexagonal ice crystals high in the atmosphere at a 46 degree angle from the light source. In contrast, regular rainbows (which refract through liquid water) occur in a 42 degree arc.But fire rainbows are not that rare. They have been photographed hundreds, if not thousands of times. I mean, there’s 4 photos here, which is more than a couple. Does not compute.$

$distant-traveller: Iridescent clouds over Thamserku Why would a cloud appear to be different colors? A relatively rare phenomenon known as iridescent clouds can show unusual colors vividly or a whole spectrum of colors simultaneously. These clouds are formed of small water droplets of nearly uniform size. When the Sun is in the right position and mostly hidden by thick clouds, these thinner clouds significantly diffract sunlight in a nearly coherent manner, with different colors being deflected by different amounts. Therefore, different colors will come to the observer from slightly different directions. Many clouds start with uniform regions that could show iridescence but quickly become too thick, too mixed, or too far from the Sun to exhibit striking colors. The above iridescent cloud was photographed in 2009 from the Himalayan Mountains in Nepal, behind the 6,600-meter peak named Thamserku. Image credit & copyright: Oleg Bartunov$

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