Toward Interpreting the IBEX Ribbon with Mirror Diffusion in Interstellar Turbulent Magnetic Fields

IF 4.8 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
Siyao 思遥 Xu 徐, Hui 晖 Li 李
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引用次数: 1

Abstract

Abstract We investigate the role of the magnetohydrodynamic (MHD) turbulence measured by Voyager in the very local interstellar medium (VLISM) in modeling the Interstellar Boundary Explorer ribbon. We demonstrate that the mirroring by compressible modes of MHD turbulence dominates over that by the mean magnetic field. Based on the new mirror diffusion mechanism identified by Lazarian & Xu for particles with large pitch angles in MHD turbulence, we find that the mirror diffusion can both confine pickup ions and preserve their initial pitch angles, and thus it accounts for the enhanced intensity of energetic neutral atoms that return to the heliosphere. The ribbon width is determined by both the range of pitch angles for effective turbulent mirroring and the field line wandering induced by Alfvénic modes. It in turn provides a constraint on the amplitude of magnetic fluctuations of fast modes. The field line wandering also affects the coherence of the ribbon structure across the sky. By extrapolating the magnetic energy spectrum measured by Voyager, we find that the injection scale of the turbulence in the VLISM must be less than ∼500 au for the ribbon structure to be coherent.
星际湍流磁场中镜像扩散对IBEX带的解释
摘要:我们研究了旅行者号在极局部星际介质(vism)中测量的磁流体动力学(MHD)湍流在模拟星际边界探索者带中的作用。我们证明了MHD湍流的可压缩模式的镜像优于平均磁场的镜像。基于Lazarian &对于MHD湍流中具有大俯仰角的粒子,我们发现镜像扩散既可以限制吸收离子,又可以保持它们的初始俯仰角,因此它解释了高能中性原子返回日球层的强度增强。条带宽度由有效紊流镜像的俯仰角范围和由alfv录影带模式引起的场线漂移共同决定。它反过来又提供了对快模磁波动幅度的约束。磁场线的漂移也影响了带状结构在天空中的相干性。通过外推旅行者号测量的磁能谱,我们发现VLISM中湍流的注入尺度必须小于~ 500 au,带状结构才能相干。
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来源期刊
Astrophysical Journal
Astrophysical Journal 地学天文-天文与天体物理
CiteScore
8.40
自引率
30.60%
发文量
2854
审稿时长
1 months
期刊介绍: The Astrophysical Journal is the foremost research journal in the world devoted to recent developments, discoveries, and theories in astronomy and astrophysics.
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