Verwichte, E. (Erwin), Foullon, C. (Claire) and Nakariakov, 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

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Abstract

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
Publisher:	EDP Sciences
ISSN:	0004-6361
Date:	June 2006
Volume:	Vol.452
Number:	No.2
Page Range:	pp. 615-622
Identification Number:	10.1051/0004-6361:20054437
Status:	Peer Reviewed
Access rights to Published version:	Open Access
Funder:	Particle Physics and Astronomy Research Council (Great Britain) (PPARC)
References:	Andries, J., Goossens, M., Hollweg, J. V., Arregui, I., & VanDoorselaere, T. 2005, A&A, 430, 1109 Aschwanden, M. J., Fletcher, L., Schrijver, C. J., & Alexander, D. 1999, ApJ, 520, 880 Aschwanden, M. J., Schrijver, C. J., De Pontieu, B., & Title, A. M. 2002, Sol. Phys., 206, 99 Aschwanden, M. J., Nightingale, R. W., Andries, J., Goossens, M., & VanDoorsselaere, T. 2003, ApJ, 598, 1375 Brady, C. S., & Arber, T. D. 2005, A&A, 438, 733 Brady, C. S., Verwichte, E., & Arber, T. D. 2006, A&A, 449, 389 Dymova, M. V., & Ruderman, M. S. 2005, Sol. Phys., 229, 79 Edwin, P. M., & Roberts, B. 1982, Sol. Phys., 76, 239 Edwin, P. M., & Roberts, B. 1983, Sol. Phys., 88, 179 Goedbloed, J. P., & Halberstadt, G. 1994, A&A, 286, 275 Goossens, M., Andries, J., & Aschwanden, M. J. 2002, A&A, 394, L39 Katsiyannis, A. C., Williams, D. R., McAteer, R. T. J., et al. 2003, A&A, 406, 709 King, D. B., Nakariakov, V. M., Deluca, E. E., Golub, L., & McClements, K. G. 2003, A&A, 404, L1 Mendoza-Briceño, C. A., Erdélyi, R., & Sigalotti, L. Di G. 2004, ApJ, 605, 493 Mikhalyaev, B. B., & Solov’ev, A. A. 2005, Sol. Phys., 227, 249 Nakariakov, V. M., Ofman, L., DeLuca, E. E., Roberts, B., & Davila, J. M. 1999, Science, 285, 862 Nakariakov, V. M., & Ofman, L. 2001, A&A, 372, L53 Nakariakov, V. M., Arber, T. D., Ault, C. E., et al. 2004, MNRAS, 349, 705 Nakariakov, V. M., & Verwichte, E. 2005, Living Rev. Sol. Phys., 2, 3, URL (cited on 2005-07-05): http://www.livingreviews.org/lrsp-2005-3 Ofman, L., & Aschwanden, M. J. 2002, ApJ, 576, L153 Roberts, B. 2000, Sol. Phys., 193, 139 Roberts, B., Edwin, P. M., & Benz, A. O. 1984, ApJ, 279, 857 Robbrecht, E., Verwichte, E., Berghmans, D., et al. 2001, A&A, 370, 591 Ruderman, M. S., & Roberts, B. 2002, ApJ, 577, 475 Uchida, Y. 1970, Publ. Astron. Soc. Jpn., 22, 341 Terradas, J., & Ofman, L. 2004, ApJ, 610, 523 Van Doorselaere, T., DeBosscher, A., Andries, J., & Poedts, S. 2004, A&A, 424, 1065 Verwichte, E., Nakariakov, V. M., & Longbottom, A. W. 1999, J. Plasma. Phys., 62, 219 Verwichte, E., Nakariakov, V. M., Ofman, L., & DeLuca, E. E. 2004, Sol. Phys., 223, 77 Verwichte, E., Foullon, C., & Nakariakov, V. M. 2006a, A&A, 446, 1139 Verwichte, E., Foullon, C., & Nakariakov, V. M. 2006b, A&A, 449, 769 Wang, T. J., & Solanki, S. K. 2004, A&A, 421, L33
URI:	http://wrap.warwick.ac.uk/id/eprint/3519

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