Introduction

  • Eugene Oks
Part of the Springer Series on Atoms+Plasmas book series (SSAOPP, volume 9)

Abstract

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).

Keywords

Anisotropy 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1995

Authors and Affiliations

  • Eugene Oks
    • 1
  1. 1.Dept. of PhysicsAuburn UniversityAuburnUSA

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