Electron parallel velocity and temperature gradient driven electrostatic fluctuations in nonuniform magnetoplasmas

P. K. Shukla, B. Coppi, B. Eliasson

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Abstract

The combined effects of the electron-temperature (ET) and parallel electron velocity (PEV) gradients on electrostaticinstabilities in a nonuniform magnetoplasma are investigated. For this purpose, a hybrid approach is used, in which the electrons are treated as a magnetized fluid, while the ions are described by means of a kinetic description. A new dispersion relation is derived, which shows how different plasma modes are linear coupled in the presence of the ET and PEV gradients. The dispersion relation is analyzed analytically (numerically) to demonstrate the instability of long- and short-wavelength electrostaticmodes (to examine the combined effects of ET and PEV gradients) in nonuniform magnetoplasmas. The present results may be useful in understanding the salient features of nonthermal fluctuations and associated anomalous cross-field electron fluxes in forthcoming laboratory experiments.
Original languageEnglish
Article number014504
Number of pages4
JournalPhysics of Plasmas
Volume14
Issue number1
DOIs
Publication statusPublished - 30 Jan 2007

Keywords

  • magnetized plasma
  • gradient
  • instabilities

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