Poynting vector

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Poynting vector

The vector cross product of the electric field E and the magnetic field H:
ams2001glos-Pe49

This vector specifies the instantaneous rate of propagation of electromagnetic energy. The amount of energy transmitted per unit time across a unit area, with normal n, is n · S. In optics, irradiance is the Poynting vector averaged over a time sufficiently long compared with the period but short when compared to the characteristic response times of radiometric instruments.

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