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Leubner, M. P.

doi:10.1023/a:1025589620768

Cited by 10 publications

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“…There are few well-known non-thermal distributions existing in literature, namely, kappa (Vasyliunas 1968), Tsallis (1988) and Cairns type distributions (Cairns et al 1995). These non-thermal particle distributions have pronounced energetic particle tails and can be generated by several different acceleration mechanisms (Leubner 2003) e.g. DC parallel electric fields (Vinäs et al 2000), field-aligned potential drops in reconnection regions (Menietti and Smith 1993; Hoffman 1993) , wave-particle interactions due to kinetic Alfven wave turbulence (Leubner 2000), lower hybrid turbulence (Shapiro et al 1995) or cyclotron resonance (Marsch and Tu 2001).…”

Section: Introductionmentioning

confidence: 99%

“…These non-thermal particle distributions have pronounced energetic particle tails and can be generated by several different acceleration mechanisms (Leubner 2003) e.g. DC parallel electric fields (Vinäs et al 2000), field-aligned potential drops in reconnection regions (Menietti and Smith 1993; Hoffman 1993) , wave-particle interactions due to kinetic Alfven wave turbulence (Leubner 2000), lower hybrid turbulence (Shapiro et al 1995) or cyclotron resonance (Marsch and Tu 2001). Ma and Summers (1998) proposed formation of power-law distributions due to electron acceleration by whistler-mode waves in space plasmas.…”

Section: Introductionmentioning

confidence: 99%

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Nonlinear ion–acoustic waves in an inhomogeneous plasma with non-thermal distribution of electrons

Singh¹

2015

J. Plasma Phys.

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In the Earth's magnetosphere, the boundary layer regions are the sources for inhomogeneous plasmas and are natural laboratories to study wave phenomena. In these regions, particles distributions also differ from Maxwellian and are found to be non-thermal. Therefore, amplitude of the waves propagating through these regions can vary differently compared to the homogeneous plasmas. In this study, propagation of ion–acoustic waves (IAWs) in an inhomogeneous, warm electron-ion plasma is examined. The electrons are considered to be having non-thermal Cairn's type distribution and ions follow the fluid dynamical equations. Further, inhomogeneity is assumed in equilibrium density of the electrons and ions. The evolution of the nonlinear IAWs is governed by the Korteweg–de Vries (KdV) equation with variable coefficients. Analytical solution of the KdV equation shows that for a cold ion plasma and non-thermal electrons, the amplitude and the width of the nonlinear IAWs decreases and increases, respectively with the inclusion of the non-thermal distribution of electrons. It is interesting to note that nonlinear IAWs in this model can not propagate for whole range of non-thermal parameter, α. The novel result of this study is that for nonlinear IAWs to propagate in the inhomogeneous two component plasma with ions and non-thermal electrons, the non-thermal parameter, α ⩽ 0.155. Results from our study may have impact on the propagation of the IAWs in the boundary layer regions of the Earth's magnetosphere where density inhomogeneities are appreciable.

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