Oblique electrostatic excitations in a magnetized plasma in the presence of excess superthermal electrons

Sultana, S.; Kourakis, Ioannis; Saini, N. S.; Hellberg, M. A.

doi:10.1063/1.3322895

Cited by 178 publications

(95 citation statements)

References 43 publications

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“…It has been shown that pair-ion plasmas with positively charged dusts support DIA solitons only of the rarefactive type. There are, however, a number of recent works dealing with the nonlinear properties of solitary waves [12][13][14][15][16][17][18][19][20][21] , electrostatic ion-cyclotron waves 22 shocks 23 in other plasma environments.…”

Section: Introductionmentioning

confidence: 99%

Oblique propagation of dust ion-acoustic solitary waves in a magnetized dusty pair-ion plasma

Misra

Barman

2014

Physics of Plasmas

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We investigate the propagation characteristics of electrostatic waves in a magnetized pair-ion plasma with immobile charged dusts. It is shown that obliquely propagating (OP) low-frequency (in comparison with the negative-ion cyclotron frequency) long-wavelength "slow" and "fast" modes can propagate, respectively, as dust ion-acoustic (DIA) and dust ion-cyclotron (DIC)-like waves. The properties of these modes are studied with the effects of obliqueness of propagation (θ), the static magnetic field, the ratios of the negative to positive ion masses (m) and temperatures (T ) as well as the dust to negative-ion number density ratio (δ). Using the standard reductive perturbation technique, we derive a Korteweg-de Vries (KdV) equation which governs the evolution of small-amplitude OP DIA waves. It is found that the KdV equation admits only rarefactive solitons in plasmas with m well below its critical value m c ( 1) which typically depends on T and δ. It is shown that the nonlinear coefficient of the KdV equation vanishes at m = m c , i.e., for plasmas with much heavier negative ions, and the evolution of the DIA waves is then described by a modified KdV (mKdV) equation. The latter is shown to have only compressive soliton solution. The properties of both the KdV and mKdV solitons are studied with the system parameters as above, and possible applications of our results to laboratory and space plasmas are briefly discussed.

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Section: Introductionmentioning

confidence: 99%

Oblique propagation of dust ion-acoustic solitary waves in a magnetized dusty pair-ion plasma

Misra

Barman

2014

Physics of Plasmas

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“…However, with more and more empirical data becoming available from space plasma systems, it is realized that in such systems, the particle distribution significantly deviates from the Maxwellian distribution [26][27][28] due to the presence of superthermal particles having high energy tails [29]. These superthermal particles can be described bydistribution rather than Maxwellian [30][31][32][33][34][35][36][37][38]. The Lorentzian (or Kappa) distribution has been widely used for conventional plasmas (not for a dust component).…”

Section: Introductionmentioning

confidence: 99%

“…The parameter determines the high energy power law index (which approaches to Maxwellian distribution for ) [40]. The distribution function was argued to provide a much better fit to existing observations than the Maxwellian [29][30][31][32][33][34][35][36][37][38][39][40][41]. The kappa distribution function applications include; for instance, the interpolation of observations in the Earth's foreshock with 3 < e < 6 [42,43] and the solar wind models with coronal electrons with 2 < e < 6 [42,44].…”

Section: Introductionmentioning

confidence: 99%

“…The distribution was first suggested by Vasyliunas [29] to model space plasmas, and was later adopted by many authors in various physical contexts. Superthermal (accelerated) particles are often present in laboratory experiments in the solar atmosphere [39] and in space plasma [30] environment. The parameter determines the high energy power law index (which approaches to Maxwellian distribution for ) [40].…”

Section: Introductionmentioning

confidence: 99%

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Large Amplitude Dust-acoustic Solitons in a Plasma Consisting of Superthermal Electron-positron Pairs and Dust Particulates

Saberian¹,

Esfandyari-Kalejahi²,

Afsari-Ghazi³

2015

TOPPJ

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Abstract:The occurrence and propagation of large amplitude dust-acoustic solitary waves (DASWs) are studied in a three-component plasma consisting of negatively charged dust grains and electron-positron pairs by employing a pseudopotential technique. Here, we focus on a superthermal plasma modeled by a -like distribution and consider a finite temperature for dust particulates. It is shown that the solitary waves with negative polarity are allowed in the system and there is a critical value for dust charge Z d above/below which the subsonic/supersonic solitary structures can propagate. In the case of negative fullerene ions, Z d = 1, it is observed that subsonic DASWs can propagate in the plasma. In addition, it is revealed that the propagation of double layers is not possible in this plasma system.

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“…Using solar wind data, Vasyliunas first predicted a non-Maxwellian distribution [13]; this distribution, which later came to be known as the ''kappa distribution,'' has been found in many magnetospheric and astrophysical environments. Ion-acoustic shock waves in plasmas consisting of superthermal electrons and positrons have been studied recently by many authors [14][15][16][17][18][19][20]; the effects of electrons and positrons on ion acoustic solitary waves have also been studied [21].…”

Section: Introductionmentioning

confidence: 99%

Korteweg–deVries–Burgers (KdVB) equation in a five component cometary plasma with kappa described electrons and ions

et al. 2016

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We investigate the existence of ion-acoustic shock waves in a five component cometary plasma consisting of positively and negatively charged oxygen ions, kappa described hydrogen ions, hot solar electrons, and slightly colder cometary electrons. The KdVB equation has been derived for the system, and its solution plotted for different kappa values, oxygen ion densities, as well as the temperature ratios for the ions. It is found that the amplitude of the shock wave decreases with increasing kappa values. The strength of the shock profile decreases with increasing temperatures of the positively charged oxygen ions and densities of negatively charged oxygen ions.

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Oblique electrostatic excitations in a magnetized plasma in the presence of excess superthermal electrons

Cited by 178 publications

References 43 publications

Oblique propagation of dust ion-acoustic solitary waves in a magnetized dusty pair-ion plasma

Oblique propagation of dust ion-acoustic solitary waves in a magnetized dusty pair-ion plasma

Large Amplitude Dust-acoustic Solitons in a Plasma Consisting of Superthermal Electron-positron Pairs and Dust Particulates

Korteweg–deVries–Burgers (KdVB) equation in a five component cometary plasma with kappa described electrons and ions

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