Recurrent explosive eruptions and the "sigmoid-to-arcade" transformation in the Sun driven by dynamical magnetic flux emergence
Date
10/05/2014Grant ID
ST/K000950/1
Keywords
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Abstract
We report on three-dimensional MHD simulations of recurrent mini coronal mass ejection (CME)-like eruptions in a small active region (AR), which is formed by the dynamical emergence of a twisted (not kink unstable) flux tube from the solar interior. The eruptions develop as a result of the repeated formation and expulsion of new flux ropes due to continuous emergence and reconnection of sheared field lines along the polarity inversion line of the AR. The acceleration of the eruptions is triggered by tether-cutting reconnection at the current sheet underneath the erupting field. We find that each explosive eruption is followed by reformation of a sigmoidal structure and a subsequent "sigmoid-to-flare arcade" transformation in the AR. These results might have implications for recurrent CMEs and eruptive sigmoids/flares observations and theoretical studies.
Citation
Archontis , V , Hood , A W & Tsinganos , K 2014 , ' Recurrent explosive eruptions and the "sigmoid-to-arcade" transformation in the Sun driven by dynamical magnetic flux emergence ' , Astrophysical Journal Letters , vol. 786 , no. 2 , L21 . https://doi.org/10.1088/2041-8205/786/2/L21
Publication
Astrophysical Journal Letters
Status
Peer reviewed
ISSN
2041-8205Type
Journal article
Rights
© 2014. The American Astronomical Society. All rights reserved.
Description
The authors acknowledge support by EU (IEF-272549 grant) and the Royal Society.Collections
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