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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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