The first gradual solar energetic particle event with an enhanced 3He abundance on Solar Orbiter

被引：0

作者：

Bucik, R. ^{[1
]}

Mason, G. M. ^{[2
]}

Gomez-Herrero, R. ^{[3
]}

Krupar, V ^{[4
,5
]}

Lario, D. ^{[4
]}

Starkey, M. J. ^{[1
]}

Ho, G. C. ^{[2
]}

Rodriguez-Pacheco, J. ^{[3
]}

Wimmer-Schweingruber, R. F. ^{[6
]}

Lara, F. Espinosa ^{[3
]}

Tadesse, T. ^{[7
]}

Balmaceda, L. ^{[4
,8
]}

Cohen, C. M. S. ^{[9
]}

Dayeh, M. A. ^{[1
]}

Desai, M., I ^{[1
]}

Kuehl, P. ^{[6
]}

Nitta, N., V ^{[10
]}

Wiedenbeck, M. E. ^{[11
]}

Xu, Z. G. ^{[6
]}

机构：

[1] Southwest Res Inst, San Antonio, TX 78238 USA

[2] Johns Hopkins Univ, Appl Phys Lab, Laurel, MD 20723 USA

[3] Univ Alcala, Space Res Grp, Alcala De Henares 28805, Spain

[4] NASA, Goddard Space Flight Ctr, Heliophys Sci Div, Greenbelt, MD 20771 USA

[5] Univ Maryland, Goddard Planetary Heliophys Inst, Baltimore, MD 21250 USA

[6] Christian Albrechts Univ Kiel, Inst Expt & Angew Phys, Kiel, Germany

[7] NASA, Johnson Space Ctr, Houston, TX 77058 USA

[8] George Mason Univ, Fairfax, VA 22030 USA

[9] CALTECH, Pasadena, CA 91125 USA

[10] Lockheed Martin Adv Technol Ctr, Palo Alto, CA 94304 USA

[11] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA

来源：

ASTRONOMY & ASTROPHYSICS | 2022年 / 669卷

关键词：

Sun; particle emission; abundances; flares; coronal mass ejections (CMEs); acceleration of particles; INNER HELIOSPHERE; RADIO; INTERPLANETARY; SUN; CONNECTION; ENERGIES; CATALOG; RATIOS; MODEL;

D O I：

10.1051/0004-6361/202245037

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The origin of He-3 abundance enhancements in gradual solar energetic particle (SEP) events remains largely unexplained. Two mechanisms have been suggested: the reacceleration of remnant flare material by coronal mass ejection (CME)-driven shocks in interplanetary space, and concomitant activity in the corona. We explore the first gradual SEP event with enhanced He-3 abundance that was observed by Solar Orbiter. The event started on 2020 November 24 and was associated with a relatively fast halo CME. During the event, the spacecraft was at 0.9 au from the Sun. The event-averaged He-3/He-4 abundance ratio is 24 times higher than the coronal or solar wind value, and the timing of the He-3 intensity was similar to that of other species. We inspected available imaging, radio observations, and the spacecraft magnetic connection to the CME source. The most probable cause of the enhanced He-3 abundance apparently are residual He-3 ions remaining from a preceding long period of He-3-rich SEPs on 2020 November 17-23.

引用

页数：9