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Mehran Shahmansouri

Mehran Shahmansouri

Academic rank: Professor
ORCID: https://orcid.org/0000-0002-1810-3206
Education: PhD.
ScopusId: 25422980900
HIndex:
Faculty: Science
Address: Physics Department/Arak University
Phone: 08632621300

Research

Title
Anisotropic temperature effects on Landau damping in Kappa–Maxwellian astrophysical plasmas
Type
JournalPaper
Keywords
Anisotropic temperature effects on Landau damping in Kappa–Maxwellian astrophysical plasmas
Year
2020
Journal Astroparticle Physics
DOI
Researchers Mehran Shahmansouri ، Moung-Jae Lee ، neda khodam ، Young-Dae Jung

Abstract

In many physical situations, especially in space, plasmas are found to have anisotropic power-law dis- tributions, i.e., they can have one-dimensional Kappa distribution with high-energy tails in a preferred direction and a Maxwellian distribution perpendicular to it. In this work, we have used this distribu- tion to study the Landau damping of electron-acoustic waves (EAWs) in the Kappa–Maxwellian plasma. A linear dispersion relation is derived, and the characteristics of the wave frequency and the Landau damp- ing rate are studied by the influence of these energetic electrons. We show that the parameters such as the ratio of thermal speed in the Kappa distribution to that of the Maxwellian, the spectral index, and the ratio of cold to hot electron densities in the Kappa distribution significantly modify the propagation characteristics of EAWs.