An Etymological Dictionary of Astronomy and Astrophysics
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Same as → spectral density.

→ power; → spectral; → density.

For a specified → bandwidth of radiation consisting of a continuous → frequency spectrum, the total → power in the bandwidth divided by the bandwidth. Spectral density describes how the power (or variance) of a time series is distributed with frequency. Also called power spectral density.

→ spectral; → density.