Generation of electromagnetic ion cyclotron instability by injection of cold beam in the presence of parallel AC field at Saturn

摘要

Electromagnetic ion cyclotron (EMIC) waves with temperature anisotropy were studied in Saturn's non-uniform magnetic layer. After the kinetic method, after injecting a cold plasma beam into the Saturn system, the growth rate of the EMIC wave was theoretically studied. An expression of the dispersion relation is drawn by using the method of the characteristic solution. Therefore, in this paper, a ring distribution is used instead of the usual Maxwellian distribution. The focus of this study is on the oblique propagation of EMIC waves, whose temperature anisotropy, ion energy density, and propagation angle vary with the direction of the magnetic field. The study found that these parameters support the growth rate of EMIC waves in the Saturn magnetosphere. Numerical analysis also shows that as the number density of cold plasma and the number of thermal plasmas increase, the growth rate of EMIC waves also increases. These results apply to the application of space plasma environments and magnetospheric systems for detailed comparison of planetary studies.