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Stability of solitary-wave solutions to a modified Zakharov–Kuznetsov equation
Ist Teil von
Journal of plasma physics, 2000-10, Vol.64 (4), p.411-426
Ort / Verlag
Cambridge, UK: Cambridge University Press
Erscheinungsjahr
2000
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
In the context of ion-acoustic waves in a magnetized plasma comprising
cold ions and non-isothermal electrons, small-amplitude, weakly nonlinear waves
have been shown previously by Munro and Parkes to be governed by a modified
version of the Zakharov–Kuznetsov equation. In this paper, we consider solitary
travelling-wave solutions to this equation that propagate along the magnetic field.
We investigate the initial growth rate γ(k) of a small transverse sinusoidal
perturbation of wavenumber k. The instability range is shown to be 0 < k < 3. We
use the multiple-scale perturbation method developed by Allen and Rowlands to
determine a consistent expansion of γ about k = 0 and k = 3. By combining these
results in the form of a Padé approximant, an analytical expression for γ is found
that is valid for 0 < k < 3. γ is also determined by using the variational method
developed by Bettinson and Rowlands. The two results for γ are compared with a
numerical determination.