Abstract
In this paper we have developed a model to study the role of both electron and ion nonthermalities on dust acoustic wave propagation in a complex plasma in presence of positively charged dust grains. Secondary electron emission from dust grains has been considered as the source of positive dust charging. As secondary emission current depends on the flux of primary electrons, nonthermality of primary electrons changes the expression of secondary emission current from that of earlier work where primary electrons were thermal. Expression of nonthermal electron current flowing to the positively charged dust grains and consequently the expression of secondary electron current flowing out of the dust grains have been first time calculated in this paper, whereas the expression for nonthermal ion current flowing to the positively charged dust grains is present in existing literature. Dispersion relation of dust acoustic wave has been derived. From this dispersion relation real frequency and growth rate of the wave have been calculated. Results have been plotted for different strength of nonthermalities of electrons and ions.
Highlights
Existence of energetic electrons with energies up to 100 keV was observed at and near the Earth’s bow shock [1]
In this paper we have developed a model to study the role of both electron and ion nonthermalities on dust acoustic wave propagation in a complex plasma in presence of positively charged dust grains
-7.5 0.01 0.011 0.012 0.013 0.014 0.015 0.016 0.017 0.018 0.019 0.02 z0. The effect of both electron and ion nonthermalities on dust acoustic wave propagation in a complex plasma in presence of positively charged dust grains has been investigated in this paper
Summary
Existence of energetic electrons with energies up to 100 keV was observed at and near the Earth’s bow shock [1]. Effects of nonthermal electrons on nonlinear dust acoustic solitary waves have been investigated in presence of negatively charged dust grains [35]. A magnetized dusty plasma consisting of positively and negatively charged adiabatic dust particles, Maxwellian ions and nonthermal electrons was considered to investigate the solitary potential structures assuming the charges on the dust grains were fixed [21]. In this paper we have developed a model to study the role of both electron and ion nonthermalities on dust acoustic wave propagation in a complex plasma in presence of positively charged dust grains. Expression of nonthermal ion current in presence of positively charged dust grains was evaluated in reference [30] using OML theory [24]-[26] to study its effect on dust acoustic wave propagation. Even weak electron nonthermality strongly destabilizes dust acoustic waves when equilibrium dust charge is positive
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
