Analytical description for energetic particle pitch angle and momentum evolution in an expanding magnetic flux rope

机译：膨胀磁通量绳索中高能粒子的俯仰角和动量演化的解析描述

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We have investigated the energetic particle transport in an interplanetary space, especially, in an expanding magnetic flux rope. The energetic particle transport in the interplanetary space is usually described by the Fokker- Planck equation including effects of pitch angle diffusion, adiabatic focusing, and adiabatic deceleration. However, for the particle transport in expanding magnetic flux rope, we have no explicit expression for pitch angle and momentum evolution such as adiabatic focusing and deceleration. In this study, we derive analytical descriptions for pitch angle evolution and momentum loss rate of energetic particles in the expanding magnetic flux rope and compare the analytical solution with numerical simulation results. The analytical solutions with ignoring particle gyration do not reproduce the results of numerical simulation even when the particle Larmor radius is several orders of magnitude smaller than the flux rope radius. Taking an effect of particle gyration into consideration, our analytical solutions correspond to the results of numerical simulations. Our analytical expression for the pitch angle evolution and momentum loss rate can be used as a pitch angle and momentum evolution term in the Fokker-Planck equation for energetic particle transport in an expanding magnetic flux rope.

机译：我们研究了在行星际空间，特别是在膨胀的磁通量绳索中的高能粒子传输。通常用Fokker-Planck方程描述行星际空间中的高能粒子传输，包括俯仰角扩散，绝热聚焦和绝热减速的影响。但是，对于膨胀磁通绳中的粒子传输，我们没有明确表示俯仰角和动量演化（如绝热聚焦和减速）。在这项研究中，我们获得了膨胀磁通量绳中高能粒子的俯仰角演变和动量损失率的解析描述，并将解析解与数值模拟结果进行了比较。即使粒子拉莫尔半径比通量绳半径小几个数量级，忽略粒子旋转的分析解决方案也不会重现数值模拟的结果。考虑到粒子旋转的影响，我们的解析解与数值模拟的结果相对应。我们对俯仰角演变和动量损失率的解析表达式可以用作Fokker-Planck方程中用于膨胀磁通量绳中高能粒子传输的俯仰角和动量演变项。

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来源
《Proceedings of the 32nd International Cosmic Ray Conference》|2011年|1-4|共4页
会议地点 Beijing(CN)
作者
YUKI KUBO; HIRONORI SHIMAZU;
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作者单位

Applied Electromagnetic Research Institute, National Institute of Information and Communications Technology, Tokyo,184-8795, Japan;

Integrated Science Data System Research Laboratory, National Institute of Information and Communications Technology, Tokyo, 184-8795, Japan Universal Communication Research Institute, National Institute of Information and Communications Technology, Kyoto,619-0289, Japan;

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会议组织
原文格式 PDF
正文语种 eng
中图分类宇宙射线强度变化;
关键词
Solar energetic particles, Magnetic flux rope, Transport equation, Method; analytical;

机译：太阳高能粒子，磁通量绳，传输方程，方法；分析型;

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专利

1. Pitch-Angle Dependent Perpendicular Diffusion of Energetic Particles Interacting With Magnetic Turbulence [J] . Gang Qin, Andreas Shalchi Applied Physics Research . 2013,第1期

机译：螺距角依赖于与电磁湍流相互作用的高能粒子的垂直扩散
2. A new generation mechanism of butterfly pitch angle distributions of energetic ions: Multiple pitch angle scattering in the stretched magnetic field [J] . K. Shibahara, M. Nose, T. A. Fritz, Journal of Geophysical Research, A. Space Physics: JGR . 2010,第A7期

机译：高能离子蝶形俯仰角分布的新一代机理：拉伸磁场中的多个俯仰角散射
3. Storm-time evolution of energetic electron pitch angle distributions by wave-particle interaction [J] . Xiao FL, He HY, Zhou QH, Plasma Science & Technology . 2008,第1期

机译：波粒子相互作用的高能电子俯仰角分布的风暴时间演化
4. Analytical description for energetic particle pitch angle and momentum evolution in an expanding magnetic flux rope [C] . YUKI KUBO, HIRONORI SHIMAZU International Cosmic Ray Conference . 2011

机译：膨胀磁通绳中的能量粒子桨距角和动量演化的分析描述
5. Ion equatorial pitch angle distributions from energetic neutral atom images obtained by IMAGE during geomagnetic storms. [D] . Zhang, Xiaoxin. 2003

机译：IMAGE在地磁风暴期间从高能中性原子图像获得的离子赤道俯仰角分布。
6. Spiky electric and magnetic field structures in flux rope experiments [O] . W. Gekelman, S. W. Tang, T. DeHaas, 2019

机译：通量绳实验中的尖峰电场和磁场结构
7. PITCH-ANGLE SCATTERING OF ENERGETIC CHARGED PARTICLES IN NEARLY CONSTANT MAGNITUDE MAGNETIC TURBULENCE [O] . Sun P., Jokipii J. R., Giacalone J. 2016

机译：几乎恒定磁通量中带电粒子的节距角散射

Analytical description for energetic particle pitch angle and momentum evolution in an expanding magnetic flux rope

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