Simulation of Plasma Emission in Magnetized Plasmas

Abstract The recent Parker Solar Probe observations of type III radio bursts show that the effects finite background magnetic field can be an important factor in interpretation data. In present paper, on plasma-emission process, which is believed to main emission mechanism for solar coronal and interplanetary bursts, are investigated by means particle-in-cell simulation method. ambient systematically surveyed varying ratio plasma frequency electron gyrofrequency. study shows a sufficiently strong field, wave–particle interaction processes lead highly field-aligned longitudinal mode excitation anisotropic velocity distribution function, accompanied significantly enhanced at second-harmonic frequency. For such case, polarization harmonic almost entirely sense extraordinary mode. On other hand, moderate strengths result less clear. underlying nonlinear-mode coupling indicate properly understand interpret results requires sophisticated analyses involving interactions among magnetized normal modes, including two transverse modes magneto-active plasma, namely, ordinary as well electron-cyclotron-whistler, oscillation, upper-hybrid modes. At present, nonlinear theory suitable quantitatively analyzing complex-mode plasmas incomplete, calls further theoretical research, but could provide guide future efforts.