Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...681l..45a&link_type=abstract
The Astrophysical Journal, Volume 681, Issue 1, pp. L45-L48.
Astronomy and Astrophysics
Astronomy
2
Magnetohydrodynamics: Mhd, Sun: Corona, Sun: Magnetic Fields
Scientific paper
We use our resistive layer model (RLM), which stresses the importance of the resistivity at the photospheric interface, to study the evolution of a solar coronal quiet region driven by subphotospheric convection. The initial version of the RLM is improved by introducing a new Boussinesq MHD model for the upper part of the convection zone (CZ), while the low-beta corona is still described by a MHD model. We compute the evolution of a weak magnetic field introduced initially in the CZ. We observe its amplification by the turbulence, the concentration of the photospheric flux at the boundaries of the convection cells, the coalescence and the cancellation of flux elements, and the transfer of about 10% of the magnetic energy into the corona. The currents associated with the nonpotential coronal field are found to be organized in filament-like localized structures due to the photospheric vortices and the complexity of the magnetic topology. Their resistive dissipation contributes to the heating of the quiet corona.
Aly Jean-Jacques
Amari Tahar
Luciani J. F.
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