Particle dynamics in a non-flaring solar active region model

J. Threlfall, Ph. -A. Bourdin, T. Neukirch, C. E. Parnell

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

The aim of this work is to investigate and characterise particle behaviour in a (observationally-driven) 3D MHD model of the solar atmosphere above a slowly evolving, non-flaring active region. We use a relativistic guiding-centre particle code to investigate particle acceleration in a single snapshot of the 3D MHD simulation. Despite the lack of flare-like behaviour in the active region, direct acceleration of electrons and protons to non-thermal energies (≲ 42 MeV) was found, yielding spectra with high-energy tails which conform to a power law. Examples of particle dynamics, including particle trapping caused by local electric rather than magnetic field effects, are observed and discussed, together with implications for future experiments which simulate non-flaring active region heating and reconnection.
Original languageEnglish
Article numberA4
Number of pages13
JournalAstronomy & Astrophysics
Volume587
Early online date11 Feb 2016
DOIs
Publication statusPublished - Mar 2016

Keywords

  • Plasmas
  • Sun: corona
  • Sun: magnetic fields
  • Sun: activity
  • Acceleration of particles

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