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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


Malcolm Druett

Eamon Scullion

Valentina Zharkova

Sarah Matthews

Luc Rouppe Van der Voort


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.

Journal Article Type Article
Publication Date Jun 27, 2017
Journal Nature Communications
Electronic ISSN 2041-1723
Publisher Nature Publishing Group
Peer Reviewed Peer Reviewed
Volume 8
Article Number 15905
Pages 13
APA6 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.
Keywords General biochemistry; Genetics and molecular biology; General physics and astronomy; General chemistry
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