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Beam electrons as a source of Hα flare ribbons

Druett, Malcolm; Scullion, Eamon; Zharkova, Valentina; Matthews, Sarah; Zharkov, Sergei; Rouppe Van der Voort, Luc

Authors

Malcolm Druett

Eamon Scullion

Valentina Zharkova

Sarah Matthews

Luc Rouppe Van der Voort



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.

Citation

Druett, M., Scullion, E., Zharkova, V., Matthews, S., Zharkov, S., & Rouppe Van der Voort, L. (2017). Beam electrons as a source of Hα flare ribbons. Nature communications, 8, 13. https://doi.org/10.1038/ncomms15905

Journal Article Type Article
Acceptance Date May 12, 2017
Online Publication Date Jun 27, 2017
Publication Date Jun 27, 2017
Deposit Date Mar 8, 2018
Publicly Available Date Mar 9, 2018
Journal Nature Communications
Electronic ISSN 2041-1723
Publisher Nature Publishing Group
Peer Reviewed Peer Reviewed
Volume 8
Article Number 15905
Pages 13
DOI https://doi.org/10.1038/ncomms15905
Keywords General biochemistry; Genetics and molecular biology; General physics and astronomy; General chemistry
Public URL https://hull-repository.worktribe.com/output/724344
Publisher URL https://www.nature.com/articles/ncomms15905
Contract Date Mar 8, 2018

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