Effects of positron density and temperature on ion-acoustic solitary waves in a magnetized electron-positron-ion plasma: Oblique propagation

Esfandyari-Kalejahi, A.; Mehdipoor, M.; Akbari-Moghanjoughi, M.

doi:10.1063/1.3142465

Cited by 32 publications

(31 citation statements)

References 32 publications

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“…[7][8][9][10][11][12][13][14][15][16][17][18][19][20] It has been shown 21 that stationary ES waves are impossible in unmagnetized symmetric pair-plasmas. On the other hand, the existence of such waves in pair-plasmas assuming a thermodynamic unequilibrium, i.e., when the temperatures of the species are different, has been investigated and confirmed in Ref.…”

Section: Introductionmentioning

confidence: 99%

Dressed electrostatic solitary excitations in three component pair-plasmas: Application in isothermal pair-plasma with stationary ions

2009

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In this work electrostatic solitary waves in a three component pair-plasma consisting of hot isothermal electrons (or negative fullerene ions), positrons (or positive fullerene ions), and stationary positive ions (say, dust particulates) are studied. Using reductive perturbation method, plasma fluid equations are reduced to a Korteweg–de Vries (KdV) equation. Considering the higher-order nonlinearity, a linear inhomogeneous equation is derived, and the stationary solutions of these coupled equations are achieved by applying the renormalization procedure of Kodama–Taniuti. It is observed that in the linear approximation and applying Fourier analysis, two electrostatic modes, namely, upper or optical and lower or acoustic modes, are present. However, the application of reductive perturbation technique confirms that only acoustic-electrostatic mode can propagate in such plasma as KdV soliton, the amplitude and width of which are studied regarding to plasma parameters σ (positron-to-electron temperature ratio) and δ (stationary cold ions-to-electron density ratio). It is also observed that the higher-order nonlinearity leads to deformation of the soliton structure from bell-shaped to W-shaped depending on the variation in values of the plasma parameters σ and δ. It is revealed that KdV-type solitary waves cannot propagate in three component pair-plasma when the pair-species temperature is equal.

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Section: Introductionmentioning

confidence: 99%

Dressed electrostatic solitary excitations in three component pair-plasmas: Application in isothermal pair-plasma with stationary ions

2009

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“…The nonlinear ionacoustic solitary waves ͑IASWs͒ are well known for their unique features and applications in optical and communication technology. 1 Propagation of IASWs has been extensively studied in weak and strongly nonlinear limits using conventional asymptotic [2][3][4][5][6][7][8][9] and Sagdeev pseudopotential [10][11][12][13][14] techniques in diverse plasma environments. Engineering's recent technological advancements in fabrication of semiconductors, nanodevices, quantum units, and their interesting physical properties 15 have directed many plasma research efforts toward the study of dense plasmas in which the quantum mechanical effects play important role.…”

Section: Introductionmentioning

confidence: 99%

Effects of ion-temperature on propagation of the large-amplitude ion-acoustic solitons in degenerate electron-positron-ion plasmas

Akbari-Moghanjoughi

2010

Physics of Plasmas

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Large-amplitude ion-acoustic solitary wave (IASW) propagation and matching criteria of existence of such waves are investigated in a degenerate dense electron-positron-ion plasma considering the ion-temperature as well as electron/positron degeneracy effects. It is shown that the ion-temperature effects play an important role in the existence criteria and allowed Mach-number range in such plasmas. Furthermore, a fundamental difference is remarked in the existence of supersonic IASW propagations between degenerate plasmas with nonrelativistic and ultrarelativistic electrons and positrons. Current study may be helpful in astrophysical as well as the laboratory inertial confinement fusion-research.

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“…Therefore, the wave frequencies should be very less than the cyclotron one, which is the case for ion acoustic and drift waves. 53 The typical data for pulsar magnetosphere region is given by 22 T e;p ¼ 10 eV:…”

Section: Parametric Investigation and Conclusionmentioning

confidence: 99%

Coupled ion acoustic and drift waves in magnetized superthermal electron-positron-ion plasmas

2014

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Linear and nonlinear coupled drift-ion acoustic waves are investigated in a nonuniform magnetoplasma having kappa distributed electrons and positrons. In the linear regime, the role of kappa distribution and positron content on the dispersion relation has been highlighted; it is found that strong superthermality (low value of κ) and addition of positrons lowers the phase velocity via decreasing the fundamental scalelengths of the plasmas. In the nonlinear regime, first, coherent nonlinear structure in the form of dipoles and monopoles are obtained and the boundary conditions (boundedness) in the context of superthermality and positron concentrations are discussed. Second, in case of scalar nonlinearity, a Korteweg–de Vries-type equation is obtained, which admit solitary wave solution. It is found that both compressive and rarefactive solitons are formed in the present model. The present work may be useful to understand the low frequency electrostatic modes in inhomogeneous electron positron ion plasmas, which exist in astrophysical plasma situations such as those found in the pulsar magnetosphere.

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Effects of positron density and temperature on ion-acoustic solitary waves in a magnetized electron-positron-ion plasma: Oblique propagation

Cited by 32 publications

References 32 publications

Dressed electrostatic solitary excitations in three component pair-plasmas: Application in isothermal pair-plasma with stationary ions

Dressed electrostatic solitary excitations in three component pair-plasmas: Application in isothermal pair-plasma with stationary ions

Effects of ion-temperature on propagation of the large-amplitude ion-acoustic solitons in degenerate electron-positron-ion plasmas

Coupled ion acoustic and drift waves in magnetized superthermal electron-positron-ion plasmas

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