A general kinetic mirror instability criterion for space applications
A general kinetic mirror instability criterion for space applications
复制标题
空间应用的通用动力镜不稳定性判据
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
N. Schupfer
中科院分区：
文献类型：
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作者：
M. Leubner;N. Schupfer
超热粒子群和损失锥结构是在空间等离子体中观察到的离子和电子速度分布的最常见特征。我们介绍了一个显着的推广家庭的卡帕分布的超热损失锥分布，适用于各种空间等离子体建模。在此基础上，从无碰撞等离子体的能量原理出发，推导出了一个通用的镜面不稳定性阈值判据，涵盖了从双温麦克斯韦到高能离子物种所占据的复杂损失锥条件的全部范围。我们表明，非热等离子体特性是显着的镜像不稳定性阈值降低的速度空间分布的特定结构占主导地位的波模激发的调节机制的来源。
Suprathermal particle populations and loss-cone structures are the most common characteristics of ion and electron velocity distributions observed in space plasmas. We introduce a significant generalization of the family of kappa distributions to a suprathermal loss-cone distribution, applicable to a variety of space plasma modeling. On the basis of this concept a general mirror instability threshold criterion is derived from an energy principle for collisionless plasmas, covering the full range from two-temperature Maxwellians to complex loss-cone conditions occupied by high-energy ion species. We demonstrate that nonthermal plasma characteristics are the source of significant mirror instability threshold reduction where the specific structure of the velocity-space distribution dominates as a regulating mechanism for wave mode excitation.