تقرير
The First Gradual Solar Energetic Particle Event With an Enhanced He-3 Abundance on Solar Orbiter
| العنوان: | The First Gradual Solar Energetic Particle Event With an Enhanced He-3 Abundance on Solar Orbiter |
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| المؤلفون: | R Bučík, G M Mason, R Gómez-Herrero, V Krupar, D Lario, M J Starkey, G C Ho, J Rodríguez-Pacheco, R F Wimmer-Schweingruber, F Espinosa Lara, T Tadesse, L Balmaceda, C M S Cohen, M A Dayeh, M I Desai, P Kühl, N V Nitta, M E Wiedenbeck, Z G Xu |
| المصدر: | Astronomy & Astrophysics. 669 |
| بيانات النشر: | United States: NASA Center for Aerospace Information (CASI), 2022. |
| سنة النشر: | 2022 |
| مصطلحات موضوعية: | Solar Physics |
| الوصف: | The origin of 3He 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 3He 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 3He/4He abundance ratio is 24 times higher than the coronal or solar wind value, and the timing of the 3He 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 3He abundance apparently are residual 3He ions remaining from a preceding long period of 3He-rich SEPs on 2020 November 17–23. |
| نوع الوثيقة: | Report |
| اللغة: | English |
| تدمد: | 1432-0746 0004-6361 |
| DOI: | 10.1051/0004-6361/202245037 |
| URL الوصول: | https://ntrs.nasa.gov/citations/20230015219 |
| ملاحظات: | 18-2HSWO2182-0010 80NSSC21K1316 80NSSC22K0757 80NSSC21M0180 80NM0018D0004 NNN06AA01C 19-HSR-192-0143 50OT0901 50OT1202 50OT1702 50OT2002 |
| رقم الأكسشن: | edsnas.20230015219 |
| قاعدة البيانات: | NASA Technical Reports |
| تدمد: | 14320746 00046361 |
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| DOI: | 10.1051/0004-6361/202245037 |