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arXiv 2109.11232astro-ph.SRphysics.space-ph
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在太阳风中作为局部产生多质子布居和束的机制的磁重联

Magnetic reconnection as a mechanism to produce multiple protonpopulations and beams locally in the solar wind

B. Lavraud, R. Kieokaew, N. Fargette, P. Louarn, A. Fedorov, N. André, G. Fruit, V. Génot, V. Réville, A. P. Rouillard, I. Plotnikov, E. Penou, A. Barthe, L. Pr… 展开作者

B. Lavraud, R. Kieokaew, N. Fargette, P. Louarn, A. Fedorov, N. André, G. Fruit, V. Génot, V. Réville, A. P. Rouillard, I. Plotnikov, E. Penou, A. Barthe, L. Prech, C. J. Owen, R. Bruno, F. Allegrini, M. Berthomier, D. Kataria, S. Livi, J. M. Raines, R. D'Amicis, J. P. Eastwood, C. Froment, R. Laker, M. Maksimovic, F. Marcucci, S. Perri, D. Perrone, T. D. Phan, D. Stansby, J. Stawarz, S. Toledo Redondo, A. Vaivads, D. Verscharen, I. Zouganelis, V. Angelini, V. Evans, T. S. Horbury, H. O'brien

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摘要：

上下文早期的太空船观测显示，太阳风中频繁出现多重质子群。几十年来，对它们起源的研究主要集中在低日冕中的磁重联和日冕中的波粒相互作用以及太阳风中的波粒相互作用等过程上，本研究旨在强调多个质子群和束也是由太阳风中局部发生的磁重联产生的。方法.我们使用高分辨率太阳轨道器质子速度分布函数测量，辅以电子和磁场数据，分析2020年7月16日缓慢Alfvénic太阳风期间多个质子群和束与磁重联的关联。结果在这一天中，至少发现了6个重联电流片，其中包括一个在之字形边界处的磁重联。这代表了测量的分布函数的2%。我们讨论了这个比例可能被低估，以及它如何可能取决于太阳风类型和距离太阳。结论.虽然这可能是一个很小的贡献，但仍有待定量评估，太阳轨道器的观测表明，磁重联必须被视为在太阳风中产生多个质子群体和光束的机制之一。

英文摘要：

Context. Spacecraft observations early revealed frequent multiple proton populations in the solar wind. Decades of research on their origin have focused on processes such as magnetic reconnection in the low corona and wave-particle interactions in the corona and locally in the solar wind.Aims.This study aims to highlight that multiple proton populations and beams are also produced by magnetic reconnection occurring locally in the solar wind. Methods. We use high resolution Solar Orbiter proton velocity distribution function measurements, complemented by electron and magnetic field data, to analyze the association of multiple proton populations and beams with magnetic reconnection during a period of slow Alfvénic solar wind on 16 July 2020. Results. At least 6 reconnecting current sheets with associated multiple proton populations and beams, including a case of magnetic reconnection at a switchback boundary, are found during this day. This represents 2% of the measured distribution functions. We discuss how this proportion may be underestimated, and how it may depend on solar wind type and distance from the Sun. Conclusions. Although suggesting a likely small contribution, but which remains to be quantitatively assessed, Solar Orbiter observations show that magnetic reconnection must be considered as one of the mechanisms that produce multiple proton populations and beams locally in the solar wind.

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