湍流星系团等离子体中水龙带和镜像涨落的非线性增长
Nonlinear growth of firehose and mirror fluctuations in turbulent galaxy-cluster plasmas
摘要：
在湍流的高β天体物理等离子体中（以星系团等离子体为例），压力各向异性驱动的水龙带和镜像波动在与湍流运动的周转时间相当的时间尺度上非线性地增长到大幅度dB/B ~ 1。它们的非线性演化的原理是产生长期增长的小尺度磁波动，这些磁波动平均抵消了造成压力各向异性的大尺度磁场的时间变化。小尺度磁涨落的存在可能会极大地影响高β天体物理等离子体的输运性质，从而影响大尺度动力学。
英文摘要：
In turbulent high-beta astrophysical plasmas (exemplified by the galaxy cluster plasmas), pressure-anisotropy-driven firehose and mirror fluctuations grow nonlinearly to large amplitudes, dB/B ~ 1, on a timescale comparable to the turnover time of the turbulent motions. The principle of their nonlinear evolution is to generate secularly growing small-scale magnetic fluctuations that on average cancel the temporal change in the large-scale magnetic field responsible for the pressure anisotropies. The presence of small-scale magnetic fluctuations may dramatically affect the transport properties and, thereby, the large-scale dynamics of the high-beta astrophysical plasmas.
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