Slowly moving test charge in a two-electron component non-Maxwellian plasma

Shahid Ali; Bengt Eliasson

doi:10.1063/1.4928901

Slowly moving test charge in a two-electron component non-Maxwellian plasma

Shahid Ali, Bengt Eliasson

Research output: Contribution to journal › Article

5 Citations (Scopus)

Abstract

Potential distributions around a slowly moving test charge are calculated by taking into account the dynamics of electron-acoustic waves (EAWs) in an unmagnetized plasma. The hot electrons are assumed to be suprathermal and obey the Kappa distribution function, whereas the cold inertial electrons are described by the Vlasov equation with a Maxwellian equilibrium distribution, and the positive ions form a static neutralizing background. The test charge moves slowly in comparison between both the hot and cold electron thermal speeds and is therefore shielded by the electrons. This gives rise to a short-range Debye-Hückel potential decaying exponentially with distance and to a far field potential decaying as inverse third power of the distance from the test charge. The results are relevant for both laboratory and space plasma, where suprathermal hot electrons with power-law distributions have been observed.

Language	English
Article number	084508
Number of pages	5
Journal	Physics of Plasmas
Volume	22
Issue number	8
DOIs	10.1063/1.4928901
Publication status	Published - 21 Aug 2015

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hot electrons

electrons

vlasov equations

space plasmas

positive ions

far fields

distribution functions

acoustics

Keywords

test charge
plasma
Maxwell equation
hot carriers

Cite this

Ali, S., & Eliasson, B. (2015). Slowly moving test charge in a two-electron component non-Maxwellian plasma. Physics of Plasmas, 22(8), [084508]. https://doi.org/10.1063/1.4928901

Ali, Shahid ; Eliasson, Bengt. / Slowly moving test charge in a two-electron component non-Maxwellian plasma. In: Physics of Plasmas. 2015 ; Vol. 22, No. 8.

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Ali, S & Eliasson, B 2015, 'Slowly moving test charge in a two-electron component non-Maxwellian plasma' Physics of Plasmas, vol. 22, no. 8, 084508. https://doi.org/10.1063/1.4928901

Slowly moving test charge in a two-electron component non-Maxwellian plasma. / Ali, Shahid; Eliasson, Bengt.

In: Physics of Plasmas, Vol. 22, No. 8, 084508, 21.08.2015.

Research output: Contribution to journal › Article

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AB - Potential distributions around a slowly moving test charge are calculated by taking into account the dynamics of electron-acoustic waves (EAWs) in an unmagnetized plasma. The hot electrons are assumed to be suprathermal and obey the Kappa distribution function, whereas the cold inertial electrons are described by the Vlasov equation with a Maxwellian equilibrium distribution, and the positive ions form a static neutralizing background. The test charge moves slowly in comparison between both the hot and cold electron thermal speeds and is therefore shielded by the electrons. This gives rise to a short-range Debye-Hückel potential decaying exponentially with distance and to a far field potential decaying as inverse third power of the distance from the test charge. The results are relevant for both laboratory and space plasma, where suprathermal hot electrons with power-law distributions have been observed.

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