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Leakage of waves from coronal loops by wave tunneling
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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. doi:10.1051/0004-6361:20054097 ISSN 0004-6361.
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Official URL: http://dx.doi.org/10.1051/0004-6361:20054097
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 | ||||||||
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Subjects: | Q Science > QB Astronomy | ||||||||
Divisions: | Faculty of Science, Engineering and Medicine > 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 | ||||||||
Official Date: | April 2006 | ||||||||
Dates: |
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Volume: | Vol.449 | ||||||||
Number: | No.1 | ||||||||
Page Range: | pp. 389-399 | ||||||||
DOI: | 10.1051/0004-6361:20054097 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Open Access (Creative Commons) |
Data sourced from Thomson Reuters' Web of Knowledge
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