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

Shahid Ali, Bengt Eliasson

Research output: Contribution to journalArticle

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.
LanguageEnglish
Article number084508
Number of pages5
JournalPhysics of Plasmas
Volume22
Issue number8
DOIs
Publication statusPublished - 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

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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-H{\"u}ckel 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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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 journalArticle

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AU - Eliasson, Bengt

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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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