Location of Repository

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

Topics:
QC

Publisher: Cambridge University Press

Year: 2007

OAI identifier:
oai:wrap.warwick.ac.uk:663

Provided by:
Warwick Research Archives Portal Repository

- (1965). Distribution Theory and Transform Analysis.
- (1954). Handbook of Elliptic Integrals for Engineers and Physicists.
- (2006). Nonlinear waves in plasmas with trapped electrons.
- (2000). Nonlinear Waves, Solitons and Chaos, 2nd edn. Cambridge: Cambridge University Press.946
- (1993). The stability of solutions to modiﬁed generalized Korteweg–de Vries, nonlinear Schr¨ odinger and Kadomtsev–Petviashvili equations.

To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.