Recurrent explosive eruptions and the "sigmoid-to-arcade" transformation in the Sun driven by dynamical magnetic flux emergence

V. Archontis, A.W. Hood, K. Tsinganos

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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.

Original languageEnglish
Article numberL21
Number of pages5
JournalAstrophysical Journal Letters
Volume786
Issue number2
Early online date22 Apr 2014
DOIs
Publication statusPublished - 10 May 2014

Keywords

  • Sun: activity
  • Sun: coronal mass ejections (CMEs)
  • Sun: magnetic fields

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