Spectral Broadening of Ion Bernstein Wave Due to Parametric Decay Instabilities

Abstract

The parametric decay instabilities (PDIs) of ion Bernstein wave with different input power levels are investigated via particle-in-cell simulation. It is found that the number of decay channels increases with the input power. Resonant mode-mode couplings dominate for a low input power. With increasing the input power, the nonresonant PDIs appear to dissipate the energy of the injected wave and give rise to edge ion heating. The generated child waves couple with each other as well as the injected wave and/or act as a pump wave to excite new decay channels. As a result, the frequency spectrum is broadened with the increase of the input power.

Nonlinear ion-acoustic solitary waves in an electron-positron-ion plasma with relativistic positron beam

“…The nonlinear propagation of solitary waves and shocks (SWS) in multicomponent plasmas has been widely studied for understanding the electrostatic disturbances in various plasma environments. [1][2][3][4][5] The study of electron-positronion (EPI) plasmas has been growing extensively due to their presence in the early universe, in the active galactic nuclei, in the pulsar magnetosphere, ionosphere, in the solar atmospheres, etc. [6][7][8][9][10][11] It is well known that when positrons are introduced into an electron-ion plasma, the response of the electrostatic waves changes significantly in comparison to the usual two component plasmas.…”