Ion acoustic solitons and supersolitons in a magnetized plasma with nonthermal hot electrons and Boltzmann cool electrons

Abstract

Arbitrary amplitude, ion acoustic solitons, and supersolitons are studied in a magnetized plasma with two distinct groups of electrons at different temperatures. The plasma consists of a cold ion fluid, cool Boltzmann electrons, and nonthermal energetic hot electrons. Using the Sagdeev pseudo-potential technique, the effect of nonthermal hot electrons on soliton structures with other plasma parameters is studied. Our numerical computation shows that negative potential ion-acoustic solitons and double layers can exist both in the subsonic and supersonic Mach number regimes, unlike the case of an unmagnetized plasma where they can only exist in the supersonic Mach number regime. For the first time, it is reported here that in addition to solitions and double layers, the ion-acoustic supersoliton solutions are also obtained for certain range of parameters in a magnetized three-component plasma model. The results show good agreement with Viking satellite observations of the solitary structures with density depletions in the auroral region of the Earth's magnetosphere.

Above the weak nonlinearity: super-nonlinear waves in astrophysical and laboratory plasmas

“…A series of publications, Rufai et al (2014Rufai et al ( , 2016a and Rufai (2015), investigate the details of oblique (with respect to the magnetic field) propagation of ion-acoustic supersolitons in a magnetised auroral plasma. Ion-beam plasmas with stationary dust grains are also found to support ion-acoustic supersolitons (Dutta and Sahu 2017).…”

“…So far, the concept of supersolitons became commonly accepted among researchers and is extensively developed in a number of recent works (see, e.g. Hellberg et al 2013;Maharaj et al 2013;Verhees et al 2013aVerhees et al , b, c, 2014Dutta et al 2014;Ghosh and Sekar Iyengar 2014;Rufai et al 2014Rufai et al , 2016aVerheest 2014;Olivier et al 2015;Rufai 2015;Verheest and Hellberg 2015;Paul and Bandyopadhyay 2016 and Sect. 3.3 for details).…”

Ion-acoustic supersolitons in the presence of non-thermal electrons

“…The model supports the existence of positive potential supersolitons in addition to regular negative and positive potential solitons [25]. For the first time, Rufai et al [26] reported obliquely propagating supersolitons in a magnetized three-component plasma model for certain range of plasma parameters. Recently, Lakhina et al [27] have shown that supersolitons cannot exist in 3-component plasmas having two types of ion species and one type of electron species with Boltzmann distribution.…”

Dust Ion Acoustic Solitary Waves in Unmagnetized Plasma with Kaniadakis Distributed Electrons

“…The IA solitons and supersolitons in magnetized plasma with two groups of electrons, i.e., nonthermal hot and Boltzmann cold electrons, are studied in Ref. [6]. In Ref.…”