School of Space Research, Kyung Hee University, Yongin, Gyeonggi 446-701, Korea.
Phys Rev Lett. 2013 Feb 15;110(7):071103. doi: 10.1103/PhysRevLett.110.071103. Epub 2013 Feb 13.
The present Letter puts forth a possible explanation for the outstanding problem of measured proton temperature anisotropy in the solar wind at 1 AU apparently being regulated by the mirror and oblique fire-hose instabilities. Making use of the fact that the local magnetic field intensity near 1 AU undergoes intermediate-scale temporal variations, the present Letter carries out the quasilinear analysis of the temperature anisotropy-driven instabilities with a time-varying local B field, assuming arbitrary initial temperature ratios and parallel betas. It is found that the saturated states in (β(∥), T(⊥)/T(∥)) space are bounded by the mirror and oblique fire-hose instabilities, which is superficially similar to the observation.
这封信件提出了一种可能的解释，用于说明在日地距离 1AU 处观测到的质子温度各向异性的突出问题，即明显受到镜向不稳定性和斜压激波不稳定性的制约。本信件利用在日地距离 1AU 附近局部磁场强度经历中等尺度时间变化这一事实，在假设任意初始温度比和平行β的情况下，对随时间变化的局部 B 场驱动温度各向异性不稳定性进行了准线性分析。结果发现，在（β(∥), T(⊥)/T(∥))空间中的饱和状态受到镜向不稳定性和斜压激波不稳定性的限制，这与观测结果表面上相似。
