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Beam electrons as a source of Hα flare ribbons View all abstracts by submitter

Valentina Zharkova   Submitted: 2017-06-27 07:18

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.

Authors: Malcolm Druett, Eamon Scullion, Valentina Zharkova, Sarah Matthews, Sergei Zharkov & Luc Rouppe Van der Voort
Projects: None

Publication Status: published in Nature Communications
Last Modified: 2017-06-28 08:41
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