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Beam electrons as a source of Hα flare ribbons

Author

Listed:
  • Malcolm Druett

    (Northumbria University, Physics and Electrical Engineering)

  • Eamon Scullion

    (Northumbria University, Physics and Electrical Engineering)

  • Valentina Zharkova

    (Northumbria University, Physics and Electrical Engineering)

  • Sarah Matthews

    (Mullard Space Science Laboratory, University College London)

  • Sergei Zharkov

    (Hull University, School of Mathematics & Physical Sciences)

  • Luc Rouppe Van der Voort

    (Institute of Theoretical Astrophysics, University of Oslo)

Abstract

The observations of solar flare onsets show rapid increase of hard and soft X-rays, ultra-violet emission with large Doppler blue shifts associated with plasma upflows, and Hα hydrogen emission with red shifts up to 1–4 Å. Modern radiative hydrodynamic models account well for blue-shifted emission, but struggle to reproduce closely the red-shifted Hα lines. Here we present a joint hydrodynamic and radiative model showing that during the first seconds of beam injection the effects caused by beam electrons can reproduce Hα line profiles with large red-shifts closely matching those observed in a C1.5 flare by the Swedish Solar Telescope. The model also accounts closely for timing and magnitude of upward motion to the corona observed 29 s after the event onset in 171 Å by the Atmospheric Imaging Assembly/Solar Dynamics Observatory.

Suggested Citation

  • Malcolm Druett & Eamon Scullion & Valentina Zharkova & Sarah Matthews & Sergei Zharkov & Luc Rouppe Van der Voort, 2017. "Beam electrons as a source of Hα flare ribbons," Nature Communications, Nature, vol. 8(1), pages 1-13, August.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_ncomms15905
    DOI: 10.1038/ncomms15905
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