skip to main content

SciTech ConnectSciTech Connect

Title: RECURRENT EXPLOSIVE ERUPTIONS AND THE ''SIGMOID-TO-ARCADE'' TRANSFORMATION IN THE SUN DRIVEN BY DYNAMICAL MAGNETIC FLUX EMERGENCE

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.
Authors:
 [1] ;  [2] ;  [3]
  1. Section of Astrophysics, Astronomy and Mechanics, Department of Physics, University of Athens, Panepistimiopolis 15784, Athens (Greece)
  2. School of Mathematics and Statistics, St. Andrews University, St. Andrews, KY169SS (United Kingdom)
  3. National Observatory of Athens, Lofos Nymphon, Thissio, Athens (Greece)
Publication Date:
OSTI Identifier:
22365861
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 786; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCELERATION; COMPUTERIZED SIMULATION; ERUPTION; MAGNETIC FIELDS; MAGNETIC FLUX; MAGNETOHYDRODYNAMICS; MASS; SHEAR; SOLAR CORONA; SUN; THREE-DIMENSIONAL CALCULATIONS; TRANSFORMATIONS; TUBES