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Resonant absorption: transformation of compressive motions into vortical motion View all abstracts by submitter

Inigo Arregui   Submitted: 2020-09-18 08:03

This paper investigates the changes in spatial properties when magnetohydrodynamic (MHD) waves undergo resonant damping in the Alfvén continuum. The analysis is carried out for a 1D cylindrical pressure-less plasma with a straight magnetic field. The effect of the damping on the spatial wave variables is determined by using complex frequencies that arise as a result of the resonant damping. Compression and vorticity are used to characterise the spatial evolution of the MHD wave. The most striking result is the huge spatial variation in the vorticity component parallel to the magnetic field. Parallel vorticity vanishes in the uniform part of the equilibrium. However, when the MHD wave moves into the non-uniform part, parallel vorticity explodes to values that are orders of magnitude higher than those attained by the transverse components in planes normal to the straight magnetic field. In the non-uniform part of the equilibrium plasma, the MHD wave is controlled by parallel vorticity and resembles an Alfvén wave, with the unfamiliar property that it has pressure variations even in the linear regime.

Authors: M. Goossens, I. Arregui, R. Soler, T. Van Doorsselaere
Projects: None

Publication Status: A&A, 641, A106 (2020)
Last Modified: 2020-09-20 12:53
Go to main E-Print page  Recurring Homologous Solar Eruptions in NOAA AR 11429  The depth and the vertical extent of the energy deposition layer in a medium-class solar flare  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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