Modulated dust-acoustic wave packets in a plasma with non-isothermal electrons and ions

Ioannis Kourakis (1) , P.K. Shukla (1)

1 ITP4 - Institut für Theoretische Physik IV [Bochum]

Nonlinear self-modulation of the dust acoustic waves is studied, in the presence of non-thermal (non-Maxwellian) ion and electron populations. By employing a multiple scale technique, a nonlinear Schrödinger-type equation (NLSE) is derived for the wave amplitude. The influence of non-thermality, in addition to obliqueness (between the propagation and modulation directions), on the conditions for modulational instability to occur is discussed. Different types of localized solutions (envelope excitations) which may possibly occur are discussed, and the dependence of their characteristics on physical parameters is traced. The ion deviation from a Maxwellian distribution comes out to be more important than the electron analogous deviation alone. Both yield a de-stabilizing effect on (the amplitude of) DAWs propagating in a dusty plasma with negative dust grains. The opposite effect, namely a tendency towards amplitude stabilization, is found for the case of positively charged dust presence in the plasma.

Mots clés: Magnetosphere; Dusty plasmas; Dust acoustic waves; Amplitude modulation; Nonlinear Schrödinger equation (NLSE); Envelope solitons; Magnetosphere.

Domaines: Physique des plasmas [physics.plasm-ph]

Ioannis Kourakis, P.K. Shukla. Modulated dust-acoustic wave packets in a plasma with non-isothermal electrons and ions. 2004. ⟨hal-00003256v2⟩