英语词汇“spectral index”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	spectral index
释义	spectral index spectral index The index, α, expressing how the flux density (S) of a radio source varies with frequency (ν). The spectrum is taken to be a power law so that either S ∝ ν^α or S ∝ ν^–α. Because α is frequently stated without its sign, it is important to be clear which definition is being used in every case. See also power-law spectrum; radio-source spectrum.
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