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Wave modes in a cold pair plasma: the complete phase and group diagram point of view
Keppens, Rony; Goedbloed, Hans
AA(Yunnan University, Kunming, PR China), AB(DIFFER, TU/e Science Park, 5612AJ Eindhoven, The Netherlands)
Journal of Plasma Physics, Volume 85, Issue 1, article id. 175850101, 11 pp.
Publication Date:
astrophysical plasmas, complex plasmas, plasma waves
Abstract Copyright:
(c) 2019: © Cambridge University Press 2019
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We present a complete analysis of all wave modes in a cold pair plasma, significantly extending standard textbook treatments. Instead of identifying the maximal number of two propagating waves at fixed frequency > omega >, we introduce a unique labelling of all 5 mode pairs described by the general dispersion relation > omega(k) >, starting from their natural ordering at small wavenumber > k >. There, the 5 pairs start off as Alfvén (A), fast magnetosonic (F), modified electrostatic (M) and electromagnetic O and X branches, and each > omega(k) > branch smoothly connects to large wavenumber resonances or limits. For cold pair plasmas, these 5 branches show avoided crossings, which become true crossings at exactly parallel or perpendicular orientation. Only for those orientations, we find a changed connectivity between small and large wavenumber behaviour. Analysing phase and group diagrams for all 5 wave modes, distinctly different from the Clemmow-Mullaly-Allis representation, reveals the true anisotropy of the A, M and O branches.
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