Seismology of curved coronal loops with vertically polarised transverse oscillations
Verwichte, E. (Erwin), Foullon, C. (Claire) and Nakariakov, V. M. (Valery M.). (2006) Seismology of curved coronal loops with vertically polarised transverse oscillations. Astronomy & Astrophysics, Vol.452 (No.2). pp. 615-622. ISSN 0004-6361
WRAP_Verwichte_74_Seismology.pdf - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
Official URL: http://dx.doi.org/10.1051/0004-6361:20054437
Aims. Using a model of vertically polarised fast magnetoacoustic waves in curved coronal loops, the method of coronal seismology is applied to observations of transverse loop oscillations.
Methods. A coronal loop is modeled as a curved magnetic slab in the zero plasma-β limit. For an arbitrary piece-wise continuous power law equilibrium density profile, the dispersion relation governing linear vertically polarised fast magnetoacoustic kink waves is derived. The ways in which this model can be used for coronal seismology are explored and applied to two observational examples.
Results. The Alfvén speed and equilibrium density profile are determined from observations. It is shown that the mechanism of lateral leakage of fast magnetoacoustic kink oscillations described in this model is efficient. In fact, the damping is so efficient that in order to match predicted values with observational ones, either the loop needs to be highly contrasted or the transverse Alfvén speed profile needs to be close to linear. Possible improvements to make the modeling of lateral wave leakage in loops more realistic, allowing a lower damping efficiency, are discussed.
|Item Type:||Journal Article|
|Subjects:||Q Science > QB Astronomy|
|Divisions:||Faculty of Science > Physics|
|Library of Congress Subject Headings (LCSH):||Solar oscillations, Sun -- Loop prominences, Sun -- Corona, Magnetohydrodynamics|
|Journal or Publication Title:||Astronomy & Astrophysics|
|Official Date:||June 2006|
|Page Range:||pp. 615-622|
|Access rights to Published version:||Open Access|
|Funder:||Particle Physics and Astronomy Research Council (Great Britain) (PPARC)|
Andries, J., Goossens, M., Hollweg, J. V., Arregui, I., & VanDoorselaere, T.
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