= Propagation-source ambiguity in an acoustic analogy
The distinction between generation and propagation depends partly on the reference operator chosen in an <acoustic analogy>. For example, a homogeneous-Laplacian operator with spatially varying reference sound speed omits the first-gradient terms of the <stratified acoustic pressure equation>. These terms then reappear as effective forcing, even for a freely propagating small disturbance in a static medium. A right-hand-side term is therefore not automatically an independent physical noise source.
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