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Grey atmosphere
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Grey atmosphere : ウィキペディア英語版
Grey atmosphere

The Grey atmosphere (or gray) is a useful set of approximations made for radiative transfer applications in studies of stellar atmospheres based on the simplification that the absorption coefficient \alpha_ of matter within the atmosphere is constant for all frequencies of incident radiation.
== Application ==
The application of the grey atmosphere approximation is the primary method astronomers use to determine the temperature and basic radiative properties of astronomical objects including the Sun, planets with atmospheres, other stars, and interstellar clouds of gas and dust. Although the model demonstrates good correlation to observations, it deviates from observational results because real atmospheres are not grey, e.g. radiation absorption is frequency-dependent.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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