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The period ratio for kink and sausage modes in a magnetic slab

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aa15460_10.pdf (636.6Kb)
Date
02/2011
Author
Macnamara, C. K.
Roberts, B.
Keywords
Corona
Oscillations
Coronal seismology
Epstein density profile
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Abstract
Aims. Increasing observational evidence of wave modes in the solar corona brings us to a closer understanding of that medium. Coronal seismology allows us to combine wave observations and theory to determine otherwise unknown parameters. The period ratio, P-1/2P(2), between the period P-1 of the fundamental mode and twice the period P-2 of its first overtone, is one such tool of coronal seismology and its departure from unity provides information about the structure of the corona. Methods. We consider analytically the period ratio for the fast kink and sausage modes of a magnetic slab, discussing both an Epstein density profile and a simple step function profile. Results. Transverse density structuring in the form of an Epstein profile or a step function profile may contribute to the shift of the period ratio for long thin slab-like structures.
Citation
Macnamara , C K & Roberts , B 2011 , ' The period ratio for kink and sausage modes in a magnetic slab ' , Astronomy & Astrophysics , vol. 526 , A75 . https://doi.org/10.1051/0004-6361/201015460
Publication
Astronomy & Astrophysics
Status
Peer reviewed
DOI
https://doi.org/10.1051/0004-6361/201015460
ISSN
0004-6361
Type
Journal article
Rights
© 2011, ESO. A&A 526, A75 (2011). Reproduced with permission from the publishers.
Description
A75 article number
Collections
  • University of St Andrews Research
URI
http://hdl.handle.net/10023/4366

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