Nonlinear dust acoustic waves in a mixed nonthermal high energy-tail electron distribution

Abstract

Large amplitude as well as weakly nonlinear dust acoustic waves in a mixed nonthermal high-energy-tail electron distribution are investigated. The effects of charge variation and electron deviation from Boltzmann distribution on the large amplitude dust acoustic soliton are then considered. The dust charge variation leads to an additional enlargement of the dust acoustic soliton, which is more pronounced as the electrons evolve far away from Maxwell-Boltzmann distribution. Under certain conditions, the dust charge fluctuation may provide an alternate physical mechanism causing anomalous dissipation, the strength of which becomes important and may prevail over that of dispersion as the suprathermal character of the plasma becomes important. The results complement and provide new insights into our previously published results on this problem [K. Aoutou, M. Tribeche, and T. H. Zerguini, Phys. Plasmas 15, 013702 (2008)].

Ion-acoustic solitary waves in a plasma with a q-nonextensive electron velocity distribution

“…It is worth to note that some recent theoretical work focused on the effects of suprathermal particles on different types of linear and nonlinear collective processes in plasmas. [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37] It has been shown that the experimental results, for electrostatic plane-wave propagation in a collisionless thermal plasma, point to a class of Tsallis velocity distribution described by a nonextensive q-parameter smaller than unity. 10 Analytic formulas both for undamped and Landau damped waves have been derived in the context of the nonextensive statistics of Tsallis.…”

Small amplitude dust‐acoustic soliton energy in dusty plasmas with suprathermal polarization force

“…In addition, it is worth to note that some physical phenomena inherent to this same model have been analysed by many authors. [18][19][20][21] Now, we derive the associated polarization force expression to our plasma model. To this end, we follow the same procedures illustrated in Ref.…”

“…The effects of these later on linear and/or nonlinear collective processes in plasmas are investigated by several authors. [13][14][15][16][17][18][19][20][21][22][23] The present manuscript is organized as follows: in the next section, we describe our plasma model and derive the associated polarization force expression. The changes caused by both non-Maxwellian polarization force and electron suprathermality on the phase speed of the linear DA mode are illustrated in Sect.…”

Role of trapped and nonthermal electron distributions in dust charging currents

“…10 Recently, it has shown that electrons and ions do not only follow the isothermal Maxwellian distribution but also follow many other nonisothermal distributions, particularly, trapped or vortexlike distribution of Schamel 11 and nonthermal distribution of Cairns et al, 12 which are very important for interpreting many space and laboratory plasma situations. [13][14][15] A large number of authors [16][17][18][19][20] have used the vortexlike distribution of Schamel 11 or nonthermal distribution of Cairns et al 12 for calculating the electron or ion number densities in a dusty plasma, and have studied the linear and properties of the dust-electroacoustic waves and associated instabilities in dusty plasmas. However, many of them have taken the roles of the population of nonthermal or trapped electrons or ions in calculating electron or ion number densities, but completely ignored their contribution in dust charging currents.…”