Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/190067
Title: Influence of large-scale interplanetary structures on the propagation of solar energetic particles: The Multispacecraft event on 2021 October 9
Author: Lario, D.
Wijsen, N.
Kwon, R.Y.
Sánchez-Cano, B.
Richardson, I.G.
Pacheco, D.
Palmerio, E.
Stevens, M.L.
Szabo, A.
Heyner, D.
Dresing, N.
Gómez-Herrero, R.
Carcaboso, F.
Aran i Sensat, Maria dels Àngels
Afanasiev, Alexander
Vainio, R.
Riihonen, E.
Poedts, S.
Brüden, M.
Xu, Z.G.
Kollhoff, A.
Keywords: Corona solar
Física solar
Partícules (Matèria)
Solar corona
Solar physics
Particles
Issue Date: 25-Jul-2022
Publisher: Institute of Physics (IOP)
Abstract: An intense solar energetic particle (SEP) event was observed on 2021 October 9 by multiple spacecraft distributed near the ecliptic plane at heliocentric radial distances R ≲ 1 au and within a narrow range of heliolongitudes. A stream interaction region (SIR), sequentially observed by Parker Solar Probe (PSP) at R = 0.76 au and 48° east from Earth (ϕ = E48°), STEREO-A (at R = 0.96 au, ϕ = E39°), Solar Orbiter (SolO; at R = 0.68 au, ϕ = E15°), BepiColombo (at R = 0.33 au, ϕ = W02°), and near-Earth spacecraft, regulated the observed intensity-time profiles and the anisotropic character of the SEP event. PSP, STEREO-A, and SolO detected strong anisotropies at the onset of the SEP event, which resulted from the fact that PSP and STEREO-A were in the declining-speed region of the solar wind stream responsible for the SIR and from the passage of a steady magnetic field structure by SolO during the onset of the event. By contrast, the intensity-time profiles observed near Earth displayed a delayed onset at proton energies ≳13 MeV and an accumulation of ≲5 MeV protons between the SIR and the shock driven by the parent coronal mass ejection (CME). Even though BepiColombo, STEREO-A, and SolO were nominally connected to the same region of the Sun, the intensity-time profiles at BepiColombo resemble those observed near Earth, with the bulk of low-energy ions also confined between the SIR and the CME-driven shock. This event exemplifies the impact that intervening large-scale interplanetary structures, such as corotating SIRs, have in shaping the properties of SEP events.
Note: Reproducció del document publicat a: https://doi.org/10.3847/1538-4357/ac6efd
It is part of: Astrophysical Journal, 2022, vol. 934, num. 55, p. 1-27
URI: http://hdl.handle.net/2445/190067
Related resource: https://doi.org/10.3847/1538-4357/ac6efd
ISSN: 0004-637X
Appears in Collections:Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))
Articles publicats en revistes (Física Quàntica i Astrofísica)

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