Realistic MHD Simulations of Formation of Sunspot-like Structures and Comparison with Observations

Details Realistic MHD Simulations of Formation of Sunspot-like Structures and Comparison with Observations Realistic MHD Simulations of Formation of Sunspot-like Structures and Comparison with Observations

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh31a1782k&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SH31A-1782

Astronomy and Astrophysics

Astrophysics

[7522] Solar Physics, Astrophysics, And Astronomy / Helioseismology, [7524] Solar Physics, Astrophysics, And Astronomy / Magnetic Fields, [7529] Solar Physics, Astrophysics, And Astronomy / Photosphere, [7544] Solar Physics, Astrophysics, And Astronomy / Stellar Interiors And Dynamo Theory

Scientific paper

The process of formation of magnetic structures such as sunspot and pores in the turbulent convection zone is still enigma. However, the recent progress in numerical radiative MHD simulations provides clues about the possible mechanism of magnetic field accumulation in spontaneously formed stable structures. Implementation of sub-grid turbulent models in our "SolarBox" code, gives us the possibility to model more accurately turbulent properties, and reproduce the dynamics of the magnetized plasma. The code takes into account non-ideal (tabular) EOS, effects of ionization, chemical composition, radiation, turbulence and magnetic field. Our simulation results show an important role of vortices, which create local cavity of pressure and are associated with strong converging flows under the surface, during the initial stage of the spontaneous structure formation. The resulting structure represents a compact self-organized concentration of strong magnetic field, reaching ~6 kG in the interior, and ~1.5 kG on the surface. It has a cluster-like internal structurization, and is maintained by strong downdrafts extending into the deep layers. We discuss the role of turbulent MHD dynamics in this mechanism, and compare the simulation results with observations of the sunspot formation process during a magnetic flux emergence, from the Solar Dynamics Observatory and Hinode.

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