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IEVref:705-02-18ID:
Language:enStatus: Standard
Term: direction of propagation (of energy)
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Definition: the time average direction of the flow of energy of an electromagnetic wave

NOTE 1 – With certain reservations, the direction of propagation of energy is that of the time average of the Poynting vector.

NOTE 2 – The direction of propagation of energy of an electromagnetic wave may differ from the direction of propagation of the wave. In practice, if the medium is not too absorbent, nor too anisotropic, nor too dispersive, the direction of propagation of energy is identical to the direction of the group velocity vector.


Publication date:1995-09
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