Applying Nyquist's method for stability determination to solar wind observations
Applying Nyquist's method for stability determination to solar wind observations
复制标题
将奈奎斯特方法应用于太阳风观测的稳定性确定
DOI：
10.1002/2017ja024486
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
M. Stevens
中科院分区：
文献类型：
--
作者：
Kristopher G. Klein;J. Kasper;K. Korreck;M. Stevens
不稳定性在控制太阳等离子体和天体物理等离子体演化中所起的作用是一个相当令人感兴趣的科学问题。这种几乎无碰撞的等离子体可以获得大量的自由能来源，这使得对不稳定行为的一般建模，解释大量人口的温度，密度，各向异性和相对漂移，在分析上很困难。因此，我们寻求一种通用的方法，可以自动化的稳定性测定，为未来的太阳风观测分析。这项工作描述了一个有效的应用程序的奈奎斯特不稳定性方法的弗拉索夫色散关系适合热，无碰撞，磁化等离子体，包括太阳风。该算法恢复了熟悉的质子温度各向异性不稳定性，以及先前使用从加里等人（2016）的原位观测中提取的拟合确定的不稳定性。这种方法的未来提出的应用进行了讨论。
The role instabilities play in governing the evolution of solar and astrophysical plasmas is a matter of considerable scientific interest. The large number of sources of free energy accessible to such nearly collisionless plasmas makes general modeling of unstable behavior, accounting for the temperatures, densities, anisotropies, and relative drifts of a large number of populations, analytically difficult. We therefore seek a general method of stability determination that may be automated for future analysis of solar wind observations. This work describes an efficient application of the Nyquist instability method to the Vlasov dispersion relation appropriate for hot, collisionless, magnetized plasmas, including the solar wind. The algorithm recovers the familiar proton temperature anisotropy instabilities, as well as instabilities that had been previously identified using fits extracted from in situ observations in Gary et al. (2016). Future proposed applications of this method are discussed.
影响因子：
7.9
作者：
Chen, C. H. K.;Matteini, L.;Bale, S. D.
通讯作者：
Bale, S. D.