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Title: A Self-consistent simulation of proton acceleration and transport near a high-speed solar wind stream
Author: Wijsen, Nicolas
Samara, Evangelia
Aran i Sensat, Maria dels Àngels
Lario, David
Pomoell, Jens
Poedts, Stefaan
Keywords: Vent solar
Acceleradors de partícules
Solar wind
Particle accelerators
Issue Date: 19-Feb-2021
Publisher: Institute of Physics (IOP)
Abstract: Solar wind stream interaction regions (SIRs) are often characterized by energetic ion enhancements. The mechanisms accelerating these particles, as well as the locations where the acceleration occurs, remain debated. Here, we report the findings of a simulation of a SIR event observed by Parker Solar Probe at ~0.56 au and the Solar Terrestrial Relations Observatory-Ahead at ~0.95 au in 2019 September when both spacecraft were approximately radially aligned with the Sun. The simulation reproduces the solar wind configuration and the energetic particle enhancements observed by both spacecraft. Our results show that the energetic particles are produced at the compression waves associated with the SIR and that the suprathermal tail of the solar wind is a good candidate to provide the seed population for particle acceleration. The simulation confirms that the acceleration process does not require shock waves and can already commence within Earth's orbit, with an energy dependence on the precise location where particles are accelerated. The three-dimensional configuration of the solar wind streams strongly modulates the energetic particle distributions, illustrating the necessity of advanced models to understand these particle events.
Note: Reproducció del document publicat a:
It is part of: Astrophysical Journal Letters, 2021, vol. 908, num. 2
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ISSN: 2041-8205
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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