捕获加速新生离子对Alfvén波的激发

The Excitation of Alfven Waves by Newborn and Pickup Ions

根据准线性方程,求出了在离子持续产生并被太阳风捕获加速的情况下离子的渐近态分布函数.采用此分布函数分析了斜向传播的Alfven波的稳定性.

The time-asymptotic distribution function of continuously created newborn and pickup ions in solar wind is obtained by solving the quasilinear kinetic equation in which we have assumed that the turbulence consists mainly of Alfven waves. The stability analysis of obliquely propagating Alfven waves is carried out.The distribution function is found to be anisotropic in velocity space and consequently can result in the excitation of Alfven waves via wave-particle interaction processes. The growthrate Is the highest in the case of parallel propagation.