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Title:
Leaky and non-leaky oscillations in magnetic flux tubes
Authors:
Cally, P. S.
Affiliation:
AA(Monash University, Clayton, Australia)
Publication:
Solar Physics (ISSN 0038-0938), vol. 103, no. 2, 1986, p. 277-298. (SoPh Homepage)
Publication Date:
02/1986
Category:
Solar Physics
Origin:
STI
NASA/STI Keywords:
SOLAR ATMOSPHERE, SOLAR MAGNETIC FIELD, SOLAR OSCILLATIONS, EIGENVALUES, H ALPHA LINE, PHOTOSPHERE, WAVE PROPAGATION
DOI:
10.1007/BF00147830
Bibliographic Code:
1986SoPh..103..277C

Abstract

An extensive analyis, both analytic and numerical, of waves in flux tubes imbedded in (possibly) magnetic surroundings is given. It is shown that any wave confined to the tube and its neighbourhood can be put into one of seven categories. Simple criteria for deciding the existence of each typ in any particular case are derived. Many other (leaky) modes are found which excite waves in the external medium and thereby lose energy to the surroundings. A number of asymptotic analyses allow much information to be gained about these without the need for numerical solution of the complicated equations involved. Three particular cases, pertaining to photospheric flux tubes, Hα fibrils, and coronal loops, are considered in detail.

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