Coronal loop slow mode oscillations driven by the kink instability
Haynes, M. (Martin), Arber, T. D. and Verwichte, E. (Erwin). (2008) Coronal loop slow mode oscillations driven by the kink instability. Astronomy & Astrophysics, Vol.479 (No.1). pp. 235-239. ISSN 0004-6361
WRAP_Haynes_45_coronal_loop_aa8534-07.pdf - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
Official URL: http://dx.doi.org/10.1051/0004-6361:20078534
Aims. To establish the dominant wave modes generated by an internal, m = 1 kink instability in a short coronal flux tube.
Methods. The 3D MHD numerical simulations are performed using Lare3d to model the kink instability and the subsequent wave generation. The initial conditions are a straight, zero net current flux tube containing a twist higher than the kink instability threshold.
Results. It is shown that the kink instability initially sets up a 1st harmonic (1st overtone) that is converted through the rearrangement of the magnetic field into two out-of-phase fundamental slow modes. These slow modes are in the two entwined flux tubes created during the kink instability.
Conclusions. The long-lived oscillations established after a kink instability provide a possible way to identify whether sudden, short coronal loop brightenings may have resulted from a confined kink instability. The mode oscillation structure changes from the 1st harmonic to fundamental due to field line relaxation. The subsequent decay in the fundamental mode is comparable to observations
and is caused by shock dissipation. This result has important consequences for the damping of the slow mode oscillations observed by SUMER.
|Item Type:||Journal Article|
|Subjects:||Q Science > QB Astronomy|
|Divisions:||Faculty of Science > Physics|
|Library of Congress Subject Headings (LCSH):||Sun -- Corona -- Magnetic fields, Sun -- Loop prominences, Solar oscillations, Solar flares|
|Journal or Publication Title:||Astronomy & Astrophysics|
|Official Date:||February 2008|
|Page Range:||pp. 235-239|
|Access rights to Published version:||Open Access|
|Funder:||Particle Physics and Astronomy Research Council (Great Britain) (PPARC)|
Amari, T., & Luciani, J. F. 1999, ApJ, 515, L81
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