Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012apj...746...81a&link_type=abstract
The Astrophysical Journal, Volume 746, Issue 1, article id. 81 (2012).
Astronomy and Astrophysics
Astronomy
2
Magnetohydrodynamics: Mhd, Sun: Corona, Sun: Surface Magnetism, Turbulence
Scientific paper
It has been suggested that the solar corona may be heated by dissipation of Alfvén waves that propagate up from the solar photosphere. According to this theory, counterpropagating Alfvén waves are subject to nonlinear interactions that lead to turbulent decay of the waves and heating of the chromospheric and coronal plasma. To test this theory, better models for the dynamics of Alfvén waves in coronal loops are required. In this paper, we consider wave heating in an active region observed with the Solar Dynamics Observatory in 2010 May. First a three-dimensional (3D) magnetic model of the region is constructed, and ten magnetic field lines that match observed coronal loops are selected. For each loop we construct a 3D magnetohydrodynamic model of the Alfvén waves near the selected field line. The waves are assumed to be generated by footpoint motions inside the kilogauss magnetic flux elements at the two ends of the loop. Based on such models, we predict the spatial and temporal profiles of the heating along the selected loops. We also estimate the temperature fluctuations resulting from such heating. We find that the Alfvén wave turbulence model can reproduce the observed characteristics of the hotter loops in the active region core, but the loops at the periphery of the region have large expansion factors and are predicted to be thermally unstable.
Asgari-Targhi Mahboubeh
van Ballegooijen Adriaan A.
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