Interplanetary ion flux dropouts across multiple 3He-rich events
Authors
Ho, G. C.; Mason, G. M.; Allen, R.C.; Wimmer-Schweingruber, R. F.; Rodríguez-Pacheco Martín, Javier; [et al.]Identifiers
Permanent link (URI): http://hdl.handle.net/10017/60656DOI: 10.3389/fspas.2022.939799
ISSN: 2296-987X
Publisher
Frontiers
Date
2022-07-14Funders
Agencia Estatal de Investigación
Bibliographic citation
Ho, G.C. [et al.], 2022, "Interplanetary ion flux dropouts across multiple 3He-rich events", Frontiers in Astronomy and Space Sciences, vol. 9, pp. 1-8.
Keywords
Energetic particle
3He-rich events
Solar Orbiter mission
Particle acceleration
Active region
Sun
Project
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/ESP2017-88436-R/ES/ENERGETIC PARTICLE DETECTOR EN SOLAR ORBITER: FASES D Y E/
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-104863RB-I00/ES/ENERGETIC PARTICLE DETECTOR EN SOLAR ORBITER: FASE E, CALIBRACION Y EXPLOTACION DE DATOS/
Document type
info:eu-repo/semantics/article
Version
info:eu-repo/semantics/publishedVersion
Publisher's version
https://doi.org/10.3389/fspas.2022.939799Rights
Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
Access rights
info:eu-repo/semantics/openAccess
Abstract
Solar Orbiter, a joint ESA/NASA mission, is studying the Sun and inner heliosphere in greater
detail than ever before. Launched in February 2020, Solar Orbiter has already completed its
first three orbits, reaching perihelia of 0.5 au from the Sun in June 2020, February and August
2021. During the first 2 years in orbit, Solar Orbiter observed multiple 3
He-rich Solar Energetic
Particle (SEP) events inside 1 au. Even though these events were small, their spectral forms,
3
He content, and association with energetic electrons and type III bursts convincingly identifies
them as 3
He-rich SEP events with properties similar to those previously observed at 1 au, and
promising new insights as Solar Orbiter moves much closer to the Sun in 2022. In May 2021,
we observed six 3
He-rich SEP events in close succession within 48 h when Solar Orbiter was
at 0.95 au. These events were likely released from the same active region at the Sun, and the
particles arrived at Solar Orbiter in two batches with various abundances and intensities,
showing strong anisotropies throughout. Multiple ion flux dropouts were also observed with
these six 3
He-rich SEP events. The fact that we observed so many ion injections in such a short
period of time indicates the 3
He enrichment and acceleration mechanism can produce SEP
from the same region very efficiently and with varying enrichment levels and intensities. In
addition, we report for the first-time dropout features that spanned multiple ion events
simultaneously. This implies the field line random walk that we observe at 1 au still
maintains magnetic connections to a small region back at the Sun up to the entire
duration of these events (~48 h).
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