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The Effect of the Ambient Solar Wind Medium on a CME-driven Shock and the Associated Gradual Solar Energetic Particle Event

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posted on 2023-09-28, 09:45 authored by Nicolas Wijsen, David Lario, Beatriz Sánchez-Cano, Immanuel C Jebaraj, Nina Dresing, Ian G Richardson, Angels Aran, Athanasios Kouloumvakos, Zheyi Ding, Antonio Niemela, Erika Palmerio, Fernando Carcaboso, Rami Vainio, Alexandr Afanasiev, Marco Pinto, Daniel Pacheco, Stefaan Poedts, Daniel Heyner

We present simulation results of a gradual solar energetic particle (SEP) event detected on 2021 October 9 by multiple spacecraft, including BepiColombo (Bepi) and near-Earth spacecraft such as the Advanced Composition Explorer (ACE). A peculiarity of this event is that the presence of a high-speed stream (HSS) affected the low-energy ion component (≲5 MeV) of the gradual SEP event at both Bepi and ACE, despite the HSS having only a modest solar wind speed increase. Using the EUHFORIA (European Heliospheric FORecasting Information Asset) magnetohydrodynamic model, we replicate the solar wind during the event and the coronal mass ejection (CME) that generated it. We then combine these results with the energetic particle transport model PARADISE (PArticle Radiation Asset Directed at Interplanetary Space Exploration). We find that the structure of the CME-driven shock was affected by the nonuniform solar wind, especially near the HSS, resulting in a shock wave front with strong variations in its properties such as its compression ratio and obliquity. By scaling the emission of energetic particles from the shock to the solar wind compression at the shock, an excellent match between the PARADISE simulation and in situ measurements of ≲5 MeV ions is obtained. Our modeling shows that the intricate intensity variations observed at both ACE and Bepi were influenced by the nonuniform emission of energetic particles from the deformed shock wave and demonstrates the influence of even modest background solar wind structures on the development of SEP events.

History

Author affiliation

School of Physics & Astronomy, University of Leicester

Version

  • VoR (Version of Record)

Published in

The Astrophysical Journal

Volume

950

Issue

2

Pagination

172

Publisher

American Astronomical Society

issn

0004-637X

eissn

1538-4357

Copyright date

2023

Available date

2023-09-28

Language

en

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