论文标题
在亚离子尺度上的星际磁场波动的Kramers-Moyal分析
Kramers-Moyal analysis of interplanetary magnetic field fluctuations at sub-ion scales
论文作者
论文摘要
在复杂动力学的统计时间序列分析的框架中，我们提出了近地环境中太阳风湍流的多尺度表征。基于Markov过程理论的数据分析旨在估计与测得的磁场波动相关的Kramers-Moyal系数。实际上，当可以成功地将尺度到尺度的动力学描述为马尔可夫过程时，一阶和二阶Kramers-Moyal系数就可以完整地描述了Langevin随机过程的动力学。分析是通过使用群集在2007年1月20日的快速太阳风期间收集的高分辨率磁场测量值进行的。该分析扩展了近阳性环境中的最新发现，目的是测试马克维亚磁场磁场波动的普遍性。
In the framework of statistical time series analysis of complex dynamics we present a multiscale characterization of solar wind turbulence in the near-Earth environment. The data analysis, based on the Markov-process theory, is meant to estimate the Kramers-Moyal coefficients associated with the measured magnetic field fluctuations. In fact, when the scale-to-scale dynamics can be successfully described as a Markov process, first- and second-order Kramers-Moyal coefficients provide a complete description of the dynamics in terms of Langevin stochastic process. The analysis is carried out by using high-resolution magnetic field measurements gathered by Cluster during a fast solar wind period on January 20, 2007. This analysis extends recent findings in the near-Sun environment with the aim of testing the universality of the Markovian nature of the magnetic field fluctuations in the sub-ion/kinetic domain.
