Amplitude modulated drift wave packets in a nonuniform magnetoplasma

作者：Shukla P K; Misra A P^*

来源：Physics Letters A, 2012, 376(38-39): 2591-2594.

DOI：10.1016/j.physleta.2012.07.008

• Drift wave
• Modulational instability
• Rogue wave
• Magnetoplasma

We consider the amplitude modulation of low-frequency, long wavelength electrostatic drift wave packets in a nonuniform magnetoplasma with the effects of equilibrium density, electron temperature and magnetic field inhomogeneities. The dynamics of the modulated drift wave packet is governed by a nonlinear Schrodinger equation. The latter is used to study the modulational instability of a Stoke%26apos;s wave train to a small longitudinal perturbation. It is shown that the drift wave packet is stable (unstable) against the modulation when the drift wave number lies in 0 %26lt; k %26lt; 1/root 2 (1/root 2 %26lt; k %26lt; 1). Thus, the modulated drift wave packet can propagate in the form of bright and dark envelope solitons or as a drift wave rogon.

• 出版日期2012-8-6