Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...301..577h&link_type=abstract
Astronomy and Astrophysics, v.301, p.577
Astronomy and Astrophysics
Astrophysics
15
Mhd, Plasmas, Methods: Numerical, Sun: Corona, Magnetic Fields
Scientific paper
Alfven resonant heating of closed coronal loops is investigated by linear magnetohydrodynamics simulations. The main subject of the presented work is the excitation of waves by the motion of the high density photospheric plasma. In recent two-dimensional calculations, the photospheric energy was introduced directly at the foot points of the loop (Strauss & Lawson 1989; Halberstadt 1994a). This enables the direct excitation of Alfven waves by purely incompressible motion, and a high rate of energy transfer from the photosphere to the dissipative layers is assured. In this paper it is emphasized that a realistic model of loop excitation by convective motion mainly involves plasma compression and therefore the introduced photospheric energy must be transferred across the magnetic field lines to reach the resonant layers. This is simulated by an excitation source which is localized towards the end points of the loop and which has an energy flux in the cross field line direction only. Both the dissipation rate, and the coupling between the source and the loop are investigated. The presence of global modes in the Alfven spectrum simultaneously enhances the coupling and the dissipation rate. An estimate of the attainable X-ray flux is made.
Goedbloed J. P.
Halberstadt G.
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