Three-stage Acceleration of Solar Energetic Particles Detected by Parker Solar Probe
| Autor: | Chen, Xiaomin, Li, Chuan |
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| Rok vydání: | 2024 |
| Předmět: | |
| Zdroj: | Published on 2024 May 28 by ApJL 967 L33 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.3847/2041-8213/ad4a79 |
| Popis: | Coronal mass ejections (CMEs) drive powerful shocks and thereby accelerate solar energetic particles (SEPs) as they propagate from the corona into interplanetary space. Here we present the processes of three-stage particle acceleration by a CME-driven shock detected by the in situ spacecraft--Parker Solar Probe (PSP) on 2022 August 27. The onset of SEPs is produced by a fast CME with a speed of 1284 km/s when it propagates to $\sim$2.85 Rs. The second stage of particle acceleration occurs when the fast CME catches up and interacts with a preceding slow one in interplanetary space at $\sim$40 Rs ($\sim$0.19 au). The CME interaction is accompanied by an intense interplanetary type II radio enhancement. Such direct measurement of particle acceleration during interplanetary CME interaction/radio enhancement is rarely recorded in previous studies. The third stage of energetic storm particles is associated with the CME-driven shock passage of the PSP at $\sim$0.38 au. Obviously, harder particle spectra are found in the latter two stages than the first one, which can arise from a stronger shock produced by the CME interaction and the enriched seed particles inside the preceding CME. Comment: 8 pages, 6 figures |
| Databáze: | arXiv |
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