Novel nonlinear mechanism of the generation of non-thermal continuum radiation

We study a novel nonlinear mechanism which could be responsible for the generation of the non-thermal continuum radiation. We propose a mathematical model and perform numerical simulations using 2-D electromagnetic code KEMPO2 to verify the proposed mechanism. In the simulation domain, we have densi...

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Bibliographic Details
Published in:Physics of plasmas 2019-02, Vol.26 (2)
Main Authors: Horký, Miroslav, Omura, Yoshiharu
Format: Article
Language:English
Subjects:
Computer simulation
Continuum radiation
Density
Electrons
Lorentz force
Magnetic fields
Mathematical models
Plasma physics
Stability
Two dimensional models
Velocity distribution
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Summary:We study a novel nonlinear mechanism which could be responsible for the generation of the non-thermal continuum radiation. We propose a mathematical model and perform numerical simulations using 2-D electromagnetic code KEMPO2 to verify the proposed mechanism. In the simulation domain, we have density gradient and ring beam electrons in the dense region as a source of electrostatic (ES) waves through ring-beam instability. These ES waves cause non-gyrotropy of the ring velocity distribution which is necessary for the generation of the harmonic waves. Velocity component vy together with magnetic field Bz of generated Z-mode waves creates Lorentz force in the x-direction (along the magnetic field). Hence, oscillating electrons emit O-mode waves to the low density area.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.5077094