Beam electrons as a source of Hα flare ribbons.

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.

journal_name

Nat Commun

journal_title

Nature communications

authors

Druett M,Scullion E,Zharkova V,Matthews S,Zharkov S,Rouppe Van der Voort L

doi

10.1038/ncomms15905

subject

Has Abstract

pub_date

2017-06-27 00:00:00

pages

15905

issn

2041-1723

pii

ncomms15905

journal_volume

8

pub_type

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