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Weakly nonlinear waves in magnetized plasma with a slightly non-Maxwellian electron distribution. Part 2. Stability of cnoidal waves

  • S. PHIBANCHON (a1), M. A. ALLEN (a1) and G. ROWLANDS (a2)

We determine the growth rate of linear instabilities resulting from long-wavelength transverse perturbations applied to periodic nonlinear wave solutions to the Schamel–Korteweg–de Vries–Zakharov–Kuznetsov (SKdVZK) equation which governs weakly nonlinear waves in a strongly magnetized cold-ion plasma whose electron distribution is given by two Maxwellians at slightly different temperatures. To obtain the growth rate it is necessary to evaluate non-trivial integrals whose number is kept to a minimum by using recursion relations. It is shown that a key instance of one such relation cannot be used for classes of solution whose minimum value is zero, and an additional integral must be evaluated explicitly instead. The SKdVZK equation contains two nonlinear terms whose ratio b increases as the electron distribution becomes increasingly flat-topped. As b and hence the deviation from electron isothermality increases, it is found that for cnoidal wave solutions that travel faster than long-wavelength linear waves, there is a more pronounced variation of the growth rate with the angle θ at which the perturbation is applied. Solutions whose minimum values are zero and which travel slower than long-wavelength linear waves are found, at first order, to be stable to perpendicular perturbations and have a relatively narrow range of θ for which the first-order growth rate is not zero.

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This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.

P. F. Byrd and M. D. Friedman 1954 Handbook of Elliptic Integrals for Engineers and Physicists. Berlin: Springer.

E. Infeld and G. Rowlands 2000 Nonlinear Waves, Solitons and Chaos, 2nd edn.Cambridge: Cambridge University Press.

S. Munro and E. J. Parkes 1999 J. Plasma Phys. 62, 305.

I. S. O'Keir and E. J. Parkes 1997 Phys. Scripta 55, 135.

E. J. Parkes 1993 J. Phys. A: Math. Gen. 26, 6469.

H. Schamel 1972 Plasma Phys. 14, 905.

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Journal of Plasma Physics
  • ISSN: 0022-3778
  • EISSN: 1469-7807
  • URL: /core/journals/journal-of-plasma-physics
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