Wave modes in a cold pair plasma: the complete phase and group diagram point-of-view

TitleWave modes in a cold pair plasma: the complete phase and group diagram point-of-view
Publication TypeJournal Article
Year of Publication2019
AuthorsR. Keppens, J.P Goedbloed
JournalJournal of Plasma Physics
Volume85
Issue1
Pagination175850101
Abstract

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 w we introduce a unique labelling of all 5 mode pairs described by the general dispersion relation w(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 w(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.

DOI10.1017/S0022377819000102
Division

FP

Department

IMM

PID

111673319632e872ccb5b43aa24b5879

Alternate TitleJ. Plasma Phys.

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