In both laboratory and natural plasmas there are two classes of Electric Fields (EFs), distinguished by the relative width of the frequency band δω/ω. These are the Quasimonochromatic Electric Fields (QEFs, δω/ω << 1) and the Broadband Electric Fields (BEFs, δω/ω ≳ 1), which act quite differently on radiating quantum systems (radiators or emitters). A plasma containing no QEFs can be seen, from the spectroscopic point of view, as BEFs of several frequency ranges acting on a radiator. That is because the chaotic thermal motion of electrons and ions corresponds to individual BEFs, whereas collective BEFs can arise as a result of plasma turbulence. To this collective BEF belong, for example, the oscillations which may be responsible for the anomalous resistivity of a plasma: ionic sound waves, Bernstein modes, etc. [1.1]. In the reference frame of ions these oscillations are of low frequency, concentrated in the band (0, ω pi ), where ω pi = (4πeN e /M)1/2 is the ionic plasma frequency (N e is the electron density).
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