Multi-ion-species effects on power spectra and autocorrelation functions of ion Bernstein waves

Ion Bernstein waves in plasmas containing multiple ion species are studied numerically. In thermal equilibrium plasmas, a great number of Bernstein waves are excited at the harmonics of ion cyclotron frequencies. The autocorrelation function of the quasi-mode consisting of these waves is strongly damped and does not recover to its initial value, even if the abundances of heavy ions are very small. (author)