Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012apj...746...31d&link_type=abstract
The Astrophysical Journal, Volume 746, Issue 1, article id. 31 (2012).
Astronomy and Astrophysics
Astronomy
Magnetohydrodynamics: Mhd, Sun: Atmosphere, Sun: Corona, Sun: Oscillations, Waves
Scientific paper
Observations have shown that transverse oscillations are present in a multitude of coronal structures. It is generally assumed that these oscillations are driven by (sub)surface footpoint motions. Using fully three-dimensional MHD simulations, we show that these footpoint perturbations generate propagating kink (Alfvénic) modes which couple very efficiently into (azimuthal) Alfvén waves. Using an ensemble of randomly distributed loops, driven by footpoint motions with random periods and directions, we compare the absolute energy in the numerical domain with the energy that is "visible" when integrating along the line of sight (LOS). We show that the kinetic energy derived from the LOS Doppler velocities is only a small fraction of the actual energy provided by the footpoint motions. Additionally, the superposition of loop structures along the LOS makes it nearly impossible to identify which structure the observed oscillations are actually associated with and could impact the identification of the mode of oscillation.
de Moortel Ineke
Pascoe David J.
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