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Article Dans Une Revue Journal of Geophysical Research Space Physics Année : 2022

Energy Spectra Variations of Energetic Ions Associated With a Stream Interaction Region

Wenwen Wei
Bin Zhuang
  • Fonction : Auteur
Jia Huang
Fang Shen
Lulu Zhao
  • Fonction : Auteur
Xiaoxin Zhang
Xueshang Feng

Résumé

Abstract Understanding the evolution of energetic particles in the heliosphere is one of the most outstanding topics in heliophysics studies. The spectra of energetic particles are pivotal to investigate their origin, acceleration and transport processes. Using STEREO A data, we investigate an intensity enhancement of energetic ions associated with a stream interaction region (SIR) during the decay phase of a gradual solar energetic particle (SEP) event. We find the SIR has fine structures include the stream interface (SI) and a forward‐reverse shock pair, and the energy spectra of energetic ion intensities show complex variations around them. Furthermore, we compare the ions' energy spectra in different regions of the SIR. The results show that this SIR is capable of accelerating protons to about 35 MeV nuc −1 , which is about two times of the upper limit of the energy as identified by previous observations, but they are still of the same order. We suggest this may be explained by the fact that the SIR could further accelerate the remnant lower energy ions from the gradual SEP event to higher energies. Moreover, the energetic ions in the SIR event have two populations that are accelerated by shock‐associated and non‐shock‐associated mechanisms, respectively. In addition, the ion intensity exhibits significant directional anisotropies during this SIR event, which may be a result of the combined influence of the transport effect, shock, and the intervening small flux rope.
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insu-04470930 , version 1 (21-02-2024)

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Copyright (Tous droits réservés)

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Wenwen Wei, Bin Zhuang, Jia Huang, Fang Shen, Lulu Zhao, et al.. Energy Spectra Variations of Energetic Ions Associated With a Stream Interaction Region. Journal of Geophysical Research Space Physics, 2022, 127 (10), ⟨10.1029/2022JA030652⟩. ⟨insu-04470930⟩
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