We have seen a variety of cloud thickness vary greatly, up to seventy-eight km thick, thin only tens of meters. There are many kinds of stratiform clouds covered the sky, isolated cloud-like product, and the like wavy cloud.
Very thick stratiform clouds or cumulonimbus clouds, the sun and the moon light transmittance is difficult to come looks very dark cloud slightly wavy and thin stratiform clouds appear to be gray, especially wavy cloud , clouds edge portion, the color is more thin clouds, light easily through, in particular, thin clouds made of ice crystals, and Winston in the sun is particularly bright, shiny with filamentous sky even with this stratiform clouds, ground objects in the sun and moon will light reflected shadow.
Sometimes the clouds thin almost can not see, but as long as the sun and moon found in the vicinity of one or several large rings, we can conclude that there is still a cloud, the cloud is called the "veil of cirrostratus." Isolated cumuliform cloud, because thick clouds, sunny side, almost all of the light reflected, therefore appears to be and the backlight side and the bottom of it, the light transmittance is not easy to come, looks dark gray.
At sunrise and sunset, as the sun's rays are dipped over, through a very thick atmosphere, molecules of air, moisture and impurities, making a large number of short-wave part of the light scattering, and red, orange longwave part, but not by much scattering when, therefore exposure to the lower atmosphere, especially the long wavelength red light occupied the absolute majority, then not only the sunrise, sunset sky is red direction, and even the clouds illuminated by its bottom edge and also turned red .
Since the composition of some cloud droplets, some ice, some two mixed together, so that when the line through the ASE, can also cause a variety of beautiful aura or iridescent.
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