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Comment on ‘Electron acoustic super solitary waves in a magnetized plasma’, J. Plasma Phys. 84, 905840406 (2018)

  • Frank Verheest (a1) (a2) and Manfred A. Hellberg (a2)

Abstract

The plasma model used in a recent paper by Kamalam et al. (J. Plasma Phys., vol. 84, 2018, 905840406) assumes a Boltzmann description for two hot ion species, in the presence of two adiabatic (fluid) electron species, for the study of obliquely propagating acoustic-type nonlinear solitary waves with respect to a static magnetic field. We argue that the assumption of Boltzmann distributions for the hot ions is incorrect, thus invalidating their conclusions, in particular about the possible occurrence of supersolitons in magnetized plasmas.

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Email address for correspondence: frank.verheest@ugent.be

References

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Buti, B. 1980 Nonlinear electron-acoustic waves in a multi-species plasma. J. Plasma Phys. 24, 169180.
Devanandhan, S., Singh, S. V., Lakhina, G. S. & Bharuthram, R. 2012 Electron acoustic waves in a magnetized plasma with kappa distributed ions. Phys. Plasmas 19, 082314.
Ghosh, S. S., Pickett, J. S., Lakhina, G. S., Winningham, J. D., Lavraud, B. & Décráu, P. M. E. 2008 Parametric analysis of positive amplitude electron acoustic solitary waves in a magnetized plasma and its application to boundary layers. J. Geophys. Res. 113, A06218.
Hellberg, M. A., Verheest, F. & Mace, R. L. 2018 The effects of finite mass, adiabaticity, and isothermality in nonlinear plasma wave studies. Phys. Plasmas 25, 032303.
Kamalam, T., Steffy, S. V. & Ghosh, S. S. 2018 Electron acoustic super solitary waves in a magnetized plasma. J. Plasma Phys. 84, 905840406.
Kamalam, T., Steffy, S. V. & Ghosh, S. S. 2019 Corrigendum: Electron acoustic super solitary waves in a magnetized plasma [Journal of Plasma Physics 84, 905840406 (2018)]. J. Plasma Phys. 85, 945850102.
Verheest, F. 2009 Oblique propagation of solitary electrostatic waves in multispecies plasmas. J. Phys. A: Math. Theor. 42, 285501.
Verheest, F., Cattaert, T., Lakhina, G. S. & Singh, S. V. 2004 Gas-dynamic description of electrostatic solitons. J. Plasma Phys. 70, 237250.
Verheest, F., Hellberg, M. A. & Lakhina, G. S. 2007 Necessary conditions for the generation of acoustic solitons in magnetospheric and space plasmas with hot ions. Astrophys. Space Sci. Trans. 3, 1520.
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