含非热电子的自引力尘埃系统中尘埃离声波的色散

General Dispersion Relation of Dust-ion-acoustic Waves in Dusty Self-gravitating Plasmas with Non-thermal Electrons

基于等离子体动理论,研究了非热电子修正的尘埃离声波(DIAW)的色散关系,分析了自引力尘埃系统中非热电子对尘埃离声波色散的影响。结果表明,非热电子和尘埃自引力对尘埃离声波色散关系具有修正效应,分析易知,离声波的相速度随着非热指数的增大而减小,而群速度随非热指数增大而增大。此外,当电子非热指数ke→∞时,该修正的尘埃离声波的色散关系回到麦氏分布的情况。研究结果可以为天体物理和实验尘埃等离子体中观测到的现象提供理论参考。

Base on the kinetic theory,the dust-ion-acoustic waves with non-thermal electron is studied in dusty self-gravitating system. The modified dispersion relation of dust-ion-acoustic waves with non-thermal electron is obtained. It is theoretically found that non-thermal electron and self-gravitating force have modified effect on the dispersion relation of dust-ion-acoustic waves, analysis is easy to know,the phase velocity of DIAW decrease when the spectrum index of non-thermal electron increase, however, the group velocity differs from that. Moreover, in the limit ke→∞, the non-thermal distribution of electron recovers to the elasscal Maxwellian distribution and the modified dispersion relation of dust-ion-acoustic waves transform to that of Maxwellian one＇s. It makes an theoretical contribution to the observed phenomenon in astrophysics and laboratory dusty-plasmas.