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This topic has appeared in the trending rankings 1 time(s) in the past year. While it does not trend frequently, its appearance suggests a renewed or concentrated surge of public interest.
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Spectral_index entered the ranking for the first time today at position #. This is its highest position ever recorded.
This topic has appeared in the English Wikipedia rankings 1 time. It first appeared on 2026-07-04 and was most recently seen on 2026-07-04.
In astronomy, the spectral index of a source is a measure of the dependence of radiative flux density on frequency. Given frequency, , in Hz and radiative flux density, in Jy, the spectral index is given implicitly by
Note that if flux does not follow a power law in frequency, the spectral index itself is a function of frequency. Rearranging the above, we see that the spectral index is given by
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