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arXiv 2602.12475astro-ph.SRphysics.space-ph
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帕克太阳探测器对具有逆速度到达(IVA)特征的太阳高能粒子(SEP)事件的观测

Parker Solar Probe observations of solar energetic particle (SEP) events with inverse velocity arrival (IVA) features

California Institute of Technology(加州理工学院);Space Sciences Laboratory, University of California, Berkeley(加州大学伯克利分校空间科学实验室);NASA Goddard Space Flight Center(美国宇航局戈达德太空飞行中心);Princeton University(普林斯顿大学)
Zigong Xu, C. M. S. Cohen, R. A. Leske, G. D. Muro, A. C. Cummings, O. M. Romeo, D. Lario, D. J. McComas, M. E. Cuesta, S. Pak, L. Y. Khoo, H. A. Farooki, M. M.… 展开作者

Zigong Xu, C. M. S. Cohen, R. A. Leske, G. D. Muro, A. C. Cummings, O. M. Romeo, D. Lario, D. J. McComas, M. E. Cuesta, S. Pak, L. Y. Khoo, H. A. Farooki, M. M. Shen, S. Kasapis, E. R. Christian, D. G. Mitchell, R. L. McNutt, A. Kouloumvakos, J. Grant Mitchell, G. D. Berland, N. A. Schwadron, M. E. Wiedenbeck, M. L. Stevens, R. C. Allen

AI总结:

研究通过帕克太阳探测器观测到具有逆速度到达特征的SEP事件,分析了其成因及影响因素,揭示了太阳高能粒子加速与传播的新机制。

摘要:

在SEP事件中,速度分散(VD)通常表现为高速高能粒子比慢粒子更早到达。2022年9月5日帕克太阳探测器(PSP)的'劳动节事件'提供了一个独特的到达轮廓,其中中等能量粒子比低能和高能粒子更早到达,形成了所谓的'鼻'结构。不同于典型VD,高能粒子比中等能粒子延迟到达,即'逆速度到达'(IVA),可能由多种加速、传输和仪器效应引起,包括激波加速。通过应用基于强度等高线的新方法,我们发现ISOIS观测中到2024年底共有14个IVA事件。进一步探讨了可能修改速度分散特征的参数,包括航天器径向距离、相应CME和激波的速度、激波法向与上游磁场的夹角以及航天器磁脚点纵向位置与日冕爆发位置的分离。早期到达粒子的能量,即'鼻'能量,可分为低(L,<0.5 MeV)、中(M,0.5-5 MeV)和高(H,>5 MeV)三类。大多数(11/14)的IVA事件具有中等鼻能量。该SEP列表为检查内日球层中的激波加速提供了材料,IVA事件的存在为SEPs的加速和传播提供了新的视角。

英文摘要:

In SEP events, velocity dispersion (VD) is characterized by the earlier arrival of faster, higher-energy particles relative to slower ones, assuming negligible acceleration time and transport effects. The "Labor Day event" at Parker Solar Probe (PSP) on 2022 September 5 provided a unique arrival profile, in which the medium energy (~ few MeV) particles arrive earlier than both lower and higher energy particles. This created a so-called "nose" structure in the intensity spectrogram formed by measurements from the two energetic particle instruments, EPI-Lo and EPI-Hi, of the Integrated Science Investigation of the Sun (ISOIS) suite. Unlike typical VD, the delayed arrival of higher energy particles compared to medium energy particles, i.e., the "inverse velocity arrival" (IVA), could be caused by various acceleration, transport, and instrumental effects, including shock acceleration. By applying a new method based on the contour-line of the intensity, we found 14 IVA events in the ISOIS observations up to the end of 2024. Several parameters that may modify velocity dispersion characteristics are further explored including the spacecraft radial distance, the speed of corresponding CMEs and shocks, the angle between the shock normal and the upstream magnetic field, and the spacecraft magnetic footpoint longitudinal separation from the flare location. The energy of the early arriving particles, i.e., the nose energy, can be grouped into low (L, <0.5 MeV), medium(M, 0.5 - 5 MeV), and high(H, >5 MeV) categories. Most (11/14) of the IVA events have medium nose energies. This SEP list provides ingredients for examination of shock acceleration in the inner heliosphere, and the existence of IVA events sheds new light on the acceleration and propagation of SEPs.

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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