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Paper: 3D MHD Simulation of Current Intensification along Serpentine Emerging Magnetic Fields
Volume: 455, 4th Hinode Science Meeting: Unsolved Problems and Recent Insights
Page: 177
Authors: Pariat, E.; Masson, S.; Aulanier, G.
Abstract: The high resolution observations of the Hinode instruments have revealed many important features of the magnetic flux evolution and its interaction with the solar plasma in emerging flux regions. The high intermittency of the magnetic field distribution in interspot regions confirms the serpentine topology adopted by the magnetic field as it cross the solar photosphere. Precise information about the evolution of localized brightenings, usually called Ellerman bombs (EBs), typical events of emerging flux regions, have been gathered by Hinode: the link between EBs and the magnetic topology, the EBs detailed spectral time evolution and their relation with other dynamic events such as small scale jets, etc. Ellerman bombs are believed to be the observational signatures of the multiple magnetic reconnections which enable the magnetic field to emerge further up and magnetically structure the corona above active regions. This work is part of a world-wide effort to model the emergence of magnetic field forming solar active regions. Using a data-driven, three-dimensional (3D) magnetohydrodynamic (MHD) numerical simulation of a flux emergence region, we study the development of 3D electric current sheets. We show that these currents buildup along the 3D serpentine magnetic-field structure as a result of photospheric diverging horizontal line-tied motions that emulate the observed photospheric evolution. We study which types of motion and magnetic topology lead to the highest current intensification and therefore to the highest reconnection probability. We discuss how these currents can explain the formation of Ellerman bombs, facilitate the flux emergence, and account for some observed pattern of emerging flux regions.
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