Nonlinear competition between the whistler and Alfvén fire hoses
Nonlinear competition between the whistler and Alfvén fire hoses
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DOI：
10.1029/2001ja900026
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发表时间：
2001-07
影响因子：
--
通讯作者：
P. Hellinger;H. Matsumoto
中科院分区：
文献类型：
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作者：
P. Hellinger;H. Matsumoto
我们研究了双麦克斯韦质子驱动的哨声和阿尔芬热电子软管之间的竞争，其中Tpk > Tp，其中Tpk和Tp是质子温度，平行于和垂直于背景磁场Re。我们扩展了Hellinger和松本（2000）的工作，使用二维混合模拟，包括两个不稳定性。在模拟中，哨声火软管最初占主导地位，并以准线性的方式饱和。Alfven消防水带不会受到哨声消防水带的强烈影响，即使在前者饱和时也会生长。然而，随着阿尔芬消防水带的增长和饱和，通过转换到阿尔芬波加热质子，由哨声消防水带驱动的波得到强烈阻尼和消失。阿尔芬波也会衰减，因此在模拟结束时，波的活动性很低。所产生的波的强烈衰减转化为p介子温度各向异性的重要降低。
We examine a competition between the whistler and Alfven fir e hoses driven by bi-Maxwellian protons with Tpk > Tp⊥, where Tpk and Tp⊥ are proton temperatures, par- allel and perpendicular to the background magnetic field, re spectively. We extend the work of Hellinger and Matsumoto(2000) using a two-dimensional hybrid simulation that includes both the instabilities. In the simulation the whistler fire h ose initially dominates and saturates in a quasi-linear manner. The Alfven fire hose is not strongl y affected by the presence of the whistler fire hose and grows even when the former is saturated . However, as the Alfven fire hose grows and saturates via a conversion to Alfven waves that heat the protons, the waves driven by the whistler fire hose get strongly damped and disap pear. The Alfven waves damp as well, so that at the end of the simulation the wave activity is low. The strong decay of the generated waves translates to an important decrease of the p roton temperature anisotropy.