Sunday, May 4, 2014

Sometimes at sunrise or sunset, when the sun will be seen in the same height on both sides of the p

Changes in natural science teaching resource platform Gao Zhan atmospheric lighting one (The Optical phenomena of Atmosphere) (I), National Taiwan Normal University, Institute of Science Education Graduate Li Ting Yi / Institute for Science Education National Taiwan Normal University Professor Xu Yingshao editor in the atmosphere, there are many phenomenon because foodmanjobs uk of the vertical structure of the atmosphere or affected by light irradiation foodmanjobs uk angle, and the formation of different lighting changes or special scene, for example: Magic Day (sundogs), halo (halo), mirage (mirage), and so on. There are a number of phenomena that we have seen in textbooks, such as Rainbow (primary rainbow) or Ni (secondary rainbow), but in fact there are many special atmospheric phenomena you may not even ever heard Oh, let us look at these Interesting lighting changes it! The following describes a particular phenomenon because the droplets caused by reflection and refraction:
Sometimes at sunrise or sunset, when the sun will be seen in the same height on both sides of the place and the sun, like two bright or fake sun spot, the two fake sun is called "Magic Day" ( Figure 1). This phenomenon usually occurs in the sun elevation is small, which is close to the time of sunrise or sunset horizon. When the sun's light shines hexagonal ice crystals in cirrus clouds in the atmosphere foodmanjobs uk in the horizontal direction, due to the physical properties of hexagonal ice crystals ice crystals refract sunlight makes the angle is limited to the minimum angle of 22 , so the location is also magic Day it is usually about 22 in the sun on both sides (Figure 2).
The magic date is not simply on the color white highlights, which will be reddish near the end of the sun, away from the sun outside the tail is white with a bit of blue. The tail is white with a band of light from the magic date horizontally extending out, its causes is because sunlight refracted by ice crystals randomly oriented, close to the red and near-blue foodmanjobs uk light distribution, both before and after a slight deviation from the position after overlap to form the overlapping part of the white band of light; rather close to the end of the reddish sun, away from the sun at one end of the blue, which is the dispersion occurs foodmanjobs uk after sun exposure to hexagonal ice crystals, forward spread into different colors, and from the same Dispersion ice out there in the middle part of the light from the partial overlap of white light (Figure 3). In addition, because the ice is "birefringent crystal," having a birefringence of light, a beam of light when it passes foodmanjobs uk through the ice, the light is split into two beams in two different directions. It will produce two separate images, and in the vicinity of the overlapping part of ghosting (Figure foodmanjobs uk 4).
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