Fast and Alfvén waves driven by azimuthal footpoint motions

Details Fast and Alfvén waves driven by azimuthal footpoint motions Fast and Alfvén waves driven by azimuthal footpoint motions

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.505..389d&link_type=abstract

In: SOLMAG 2002. Proceedings of the Magnetic Coupling of the Solar Atmosphere Euroconference and IAU Colloquium 188, 11 - 15 Jun

Physics

Solar Coronal Loops, Alfven Waves

Scientific paper

The excitation of Alfvén and fast magnetosonic waves in footpoint driven coronal loops is studied in the framework of resonant absorption. Previous studies revealed that in case of radial footpoint motions, quasi-modes are essential for effective wave dissipation in the loops. We now investigate the role they play in azimuthally driven loops. For a periodic driver, the efficiency of resonant absorption strongly depends on the driving frequency ωd: only for quasi-mode frequencies coupling has a positive effect on the growth of the (single) Alfvén resonance. The problem of single-shell heating can be solved by considering a more realistic, random driver: a variety of resonant Alfvén waves are excited and multiple resonant peaks appear, with length scales which are short enough for effective dissipation. When more realistic loop lengths are considered, the resonant surfaces are even more numerous resulting in globally heated loops.

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