Forced wave

From Glossary of Meteorology
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forced wave

Any wave that is required to fit irregularities at the boundary of a system or satisfy some impressed force within the system.

The forced wave will not in general be a characteristic mode of oscillation of the system. It cannot be exhibited independently unless the system admits no free waves. A homogeneous incompressible fluid bounded by two rigid surfaces is an example of such a system. The gravity lee wave in the atmosphere is an example of mixed forced and free waves.
See resonance, oscillation.