Abstract
Modulational instability of ion-acoustic waves has been theoretically investigated in an unmagnetized collisionless plasma with nonthermal electrons, Boltzmann positrons, and warm positive ions. To describe the nonlinear evolution of the wave amplitude a nonlinear Schrödinger (NLS) equation has been derived by using multiple scale perturbation technique. The nonthermal parameter, positron concentration, and ion temperature are shown to play significant role in the modulational instability of ion-acoustic waves and the formation of envelope solitons.
Highlights
Electron-positron-ion (e-p-i) plasmas occur in many astrophysical environments such as active galactic nuclei [1], pulsar magnetospheres [2], polar regions of neutron stars [3], centres of our galaxy [4], the early universe [5, 6], and the solar atmosphere [7]
Over the last two decades there has been a great deal of interest in the study of nonlinear wave phenomena in e-p-i plasmas [8,9,10,11,12]
Pakzad [11] has shown that the presence of warm ions and nonthermal electrons can modify parametric regions of existence of ion-acoustic solitary waves
Summary
Electron-positron-ion (e-p-i) plasmas occur in many astrophysical environments such as active galactic nuclei [1], pulsar magnetospheres [2], polar regions of neutron stars [3], centres of our galaxy [4], the early universe [5, 6], and the solar atmosphere [7]. The presence of non-Maxwellian electron is common in space and astrophysical plasmas including the magnetosphere [12] and auroral zones [14] The presence of such non-Maxwellian electrons gives rise to many interesting characteristics in the nonlinear propagation of waves including the ion-acoustic solitons [15, 16]. It is interesting to study the nonlinear ion-acoustic waves in e-p-i plasma assuming simultaneous presence of nonthermal electrons, warm negative ions, and the positrons. Mahmood et al [27] have studied modulational instability of ion-acoustic waves in e-p-i plasma with warm ions and isothermal electrons and positrons at the same temperature. The purpose of the present paper is to make a detailed study of modulational instability of ionacoustic waves in e-p-i plasma including simultaneously both the effects of nonthermality of electrons and ion-temperature
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