Longitudinal Extent of 3He-rich Solar Energetic Particle Events Near 1 au

Autor: George C. Ho, Glenn M. Mason, Robert C. Allen, Athanasios Kouloumvakos, Robert F. Wimmer-Schweingruber, Javier Rodrígzuez-Pacheco
Jazyk: angličtina
Rok vydání: 2024
Předmět:
Zdroj: The Astrophysical Journal, Vol 974, Iss 1, p 68 (2024)
Druh dokumentu: article
ISSN: 1538-4357
DOI: 10.3847/1538-4357/ad67ce
Popis: Multispacecraft observations of ^3 He-rich solar energetic particle (SEP) events are scarce, but much needed in order to understand and properly constrain the source and transport of these remarkably enriched ^3 He SEP events. In this paper, we report 15 ^3 He-rich SEP events that were detected by the Advanced Composition Explorer, the Solar Terrestrial Relations Observatory, and Solar Orbiter near 1 au during Solar Orbiter’s aphelion pass at the end of 2022 and early 2023. Three (five) of these events were detected simultaneously by at least two (three) spacecraft at up to ∼40° longitudinal separation, while seven events were detected by only a single spacecraft, even though an adjacent spacecraft was less than 20° apart. Using a magnetic connectivity tool, we show statistically that there is a >50% probability of detection when the spacecraft-modeled footpoints have an angular separation angle of
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