Heavy-ion Acceleration in 3He-rich Solar Energetic Particle Events: New Insights from Solar Orbiter

IF 4.8 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS Astrophysical Journal Pub Date : 2023-11-01 DOI:10.3847/1538-4357/acf31b
G. M. Mason, I. Roth, N. V. Nitta, R. Bučík, D. Lario, G. C. Ho, R. C. Allen, A. Kouloumvakos, R. F. Wimmer-Schweingruber, J. Rodriguez-Pacheco
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Abstract

Abstract We present Solar Orbiter energetic particle observations of two 3 He-rich events with features more clearly observed than in prior studies. The event of 2022 November 9 observed from 0.59 au contained hundreds of ultraheavy (UH; mass >78 amu) ions whereas previous observations at 1 au have shown only an occasional count or two. The event of 2023 April 8 observed from 0.29 au fortuitously had very low ambient activity, making it possible to observe spectra from the 3 He acceleration mechanism without contamination, revealing extremely low H and 4 He intensities arriving simultaneously with other ions observed in typical 3 He-rich events. Taken together with previous studies, we believe these data show that 3 He-rich events have a single acceleration mechanism that is responsible for the unique abundance features of 3 He, heavy ions, and UH ions. Considering the acceleration model of Roth & Temerin that heats the ions over a broad range of gyrofrequencies away from those damped by H and 4 He, we calculate reasonable fits to the observed abundances O–Fe. A key result is that high values of, e.g., Fe/O typical of such events is not due to preferential Fe heating, but on the contrary is due mainly to the depletion of O, which at elevated temperatures has a charge-to-mass ratio in the region of the waves damped by 4 He. The model also naturally incorporates features of high-ionization states and neutron-rich isotope enhancements that have been long-standing puzzles in observations of this type of flare.
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富3he太阳高能粒子事件中的重离子加速:来自太阳轨道器的新见解
摘要:我们提出了太阳轨道器对两个3富氦事件的高能粒子观测,其特征比以前的研究更清楚地观察到。从0.59 au观测到的2022年11月9日的事件包含数百个超重(UH;质量为78 μ au的离子,而之前在1au的观测只显示了偶尔的一两个计数。在0.29 au观测到的2023年4月8日事件碰巧具有非常低的环境活度,这使得在没有污染的情况下观测到3 He加速机制的光谱成为可能,揭示了在典型的3 He富事件中观测到的其他离子同时到达的极低H和4 He强度。结合之前的研究,我们认为这些数据表明,3个He-富事件具有单一的加速机制,这是3个He、重离子和UH离子具有独特丰度特征的原因。考虑Roth的加速度模型;在较宽的回旋频率范围内加热离子,使其远离氢和氦的阻尼,我们计算出与观测到的O-Fe丰度的合理拟合。一个关键的结果是,这种事件典型的高值,例如Fe/O,不是由于优先的Fe加热,而是相反,主要是由于O的耗尽,在高温下,O在4 He阻尼的波区域具有电荷质量比。该模型还自然地结合了高电离态和富中子同位素增强的特征,这些特征长期以来一直是观测这类耀斑的难题。
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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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