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arXiv 2406.05765astro-ph.SRphysics.plasm-phphysics.space-ph
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太阳高能粒子质子和电子平行平均自由程的详细综述

A detailed survey of the parallel mean free path of solar energetic particle protons and electrons

J. T. Lang, R. D. Strauss, N. E. Engelbrecht, J. P. van den Berg, N. Dresing, D. Ruffolo, R. Bandyopadhyay

AI总结:

本文通过一维SEP传输模型反演十多个太阳高能粒子事件中质子和电子的平行平均自由程,并与基于观测湍流量的理论估计对比,发现质子吻合良好且逐事件变化源于背景湍流自然变化,电子结果对湍流耗散区细节高度敏感。

摘要:

在这项工作中,识别了十多个太阳高能粒子(SEP)事件,这些事件的源区在磁场上与至少一个位于1 au处的航天器良好连接。将所有可用的质子和电子能量通道观测到的强度-时间剖面,与使用数值一维SEP传输模型计算得到的结果进行比较,以推导1 au处作为能量(或刚度)函数的平行平均自由程(pMFPs)。随后,将这些反演结果与pMFP的理论估计进行比较,理论估计使用观测到的湍流量以及具有观测依据的变化作为输入。对于质子,反演结果与理论结果之间获得了非常好的比较。结果表明,观测到的反演pMFP值的逐事件变化可以由背景湍流值的自然变化来解释。对于电子,与假设动力学湍流阻尼模型推导出的pMFP有相对较好的一致性,尽管理论值对湍流耗散区的细节极其敏感,而这些细节本身表现出高度的变化。

英文摘要:

In this work, more than a dozen solar energetic particle (SEP) events are identified where the source region is magnetically well-connected to at least one spacecraft at 1~au. The observed intensity-time profiles, for all available proton and electron energy channels, are compared to results computed using a numerical 1D SEP transport model in order to derive the parallel mean free paths (pMFPs) as a function of energy (or rigidity) at 1~au. These inversion results are then compared to theoretical estimates of the pMFP, using observed turbulence quantities with observationally-motivated variations as input. For protons, a very good comparison between inversion and theoretical results is obtained. It is shown that the observed inter-event variations in the inversion pMFP values can be explained by natural variations in the background turbulence values. For electrons, there is relatively good agreement with pMFPs derived assuming the damping model of dynamical turbulence, although the theoretical values are extremely sensitive to the details of the turbulence dissipation range which themselves display a high level of variation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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