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

Abstract

We report on three-dimensional (3D) MHD simulations of recurrent mini 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 are developed as a result of repeated formation and expulsion of new flux ropes due to continous emergence and reconnection of sheared fieldlines along the polarity inversion line (PIL) 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.

4 pages, 4 figures

References in corpus (4)

• Driving major solar flares and eruptions: a review
• Sigmoid-to-Flux-Rope Transition Leading to A Loop-Like Coronal Mass Ejection
• Eruption of magnetic flux ropes during flux emergence
• A flux emergence model for solar eruptions

Cited by in corpus (12)

• Decoding the Pre-Eruptive Magnetic Field Configurations of Coronal Mass Ejections
• Numerical Simulations of Flare-productive Active Regions: delta-sunspots, Sheared Polarity Inversion Lines, Energy Storage, and Predictions
• Validation and Benchmarking of a Practical Free Magnetic Energy and Relative Magnetic Helicity Budget Calculation in Solar Magnetic Structures
• The eruption of a small-scale emerging flux rope as the driver of an M-class flare and a coronal mass ejection
• Very fast helicity injection leading to critically stable state and large eruptive activity in solar active region NOAA 12673
• Successive Homologous Coronal Mass Ejections driven by shearing and converging motions in solar active region NOAA 12371
• Filament Eruption and Its Reformation Caused by Emerging Magnetic Flux
• The emergence of magnetic flux and its role on the onset of solar dynamic events
• A Model of Homologous Confined and Ejective Eruptions Involving Kink Instability and Flux Cancellation
• Validation of the magnetic energy vs. helicity scaling in solar magnetic structures
• Lorentz Force Evolution Reveals the Energy Buildup Processes during Recurrent Eruptive Solar Flares
• Effects of partial ionization on magnetic flux emergence in the Sun