Brady, Christopher S., Verwichte, E. (Erwin) and Arber, T. D.. (2006) Leakage of waves from coronal loops by wave tunneling. Astronomy & Astrophysics, Vol.449 (No.1). pp. 389-399. ISSN 0004-6361

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Abstract

To better understand the decay of vertically polarised fast kink modes of coronal loops by the mechanism of wave tunneling, simulations are performed of fast kink modes in straight flux slabs which have Alfvén speed profiles which include a tunneling region. The decay rates are found to be determined by the mode number of the trapped mode and the thickness of the tunneling region. Two analytical models are suggested to explain the observed decay. The first is a extension of the work of Roberts (1981, Sol. Phys., 69, 39) to include a finite thickness tunneling region, and the second is a simpler model which yields an analytical solution for the relationship between decay rate, period and the thickness of the tunneling region. The decay rates for these straight slabs are found to be slower than in observations and those found in a previous paper on the subject by Brady & Arber (2005, A&A, 438, 733) using curved flux slabs. It is found that the difference between the straight slabs used here and the curved slabs used in Brady & Arber (2005, A&A, 438, 733) can be represented as a geometric correction to the decay rate.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Sun -- Loop prominences, Solar oscillations, Sun -- Corona, Solar magnetic fields
Journal or Publication Title:	Astronomy & Astrophysics
Publisher:	EDP Sciences
ISSN:	0004-6361
Date:	April 2006
Volume:	Vol.449
Number:	No.1
Page Range:	pp. 389-399
Identification Number:	10.1051/0004-6361:20054097
Status:	Peer Reviewed
Access rights to Published version:	Open Access
References:	Arber, T. D., Longbottom, A.W., Gerrard, C. L.,&Milne, A. M. 2001, JCP, 170, 151 Aschwanden, M. J., Fletcher, L., Schrijver, C. J., & Alexander, D. 1999, ApJ, 620, 880 Brady, C. S., & Arber, T. D. 2005, A&A, 438, 733 Van Doorsselaere, T., Debosscher, A., Andries, J., & Poedts, S. 2004, A&A, 424, 1065 Nakariakov, V. M., Ofman, L., DeLuca, E. E., Roberts, B., & Davila, J. M. 1999, Science, 285, 862 Ofman, L., & Aschwanden, M. J. 2002, ApJ, 576, 2, L153 Roberts, B. 1981, Sol. Phys., 69, 39 Roberts, B. 2000, Sol. Phys., 193, 139 Roberts, B., Edwin, P. M., & Benz, A. O. 1983, Nature, 305, 688 Roberts, B., Edwin, P. M., & Benz, A. O. 1984, ApJ, 279, 857 Ruderman, M. S., & Roberts, B. 2002, ApJ, 577, 475 Selwa, M.,Murawski, K., Solanki, S. K.,Wang, T. J.,& Tóth, G. 2005, A&A, 440, 385 Wang, T. J., & Solanki, S. K. 2004, A&A, 421, L33 Verwichte, E., Foullon, C., & Nakariakov, V. M. 2006, A&A, 446, 1139
URI:	http://wrap.warwick.ac.uk/id/eprint/3567

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