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Title: Wave propagation in sunspots
Authors: Hasan, S. S
Keywords: Solar atmosphere;Sunspots;Umbras;Wave propagation;Photosphere;Rayleigh-Ritz method;Variational principles
Issue Date: 1990
Publisher: International Astronomical Union
Citation: IAU Symposium, No. 142, pp. 189 - 191
Abstract: Wave propagation in sunspot umbrae is analyzed; the stratification in a typical umbra is approximated by a model atmosphere, extending vertically from a depth of a few thousand kilometers below the photosphere, to the transition region. A Rayleigh-Ritz variational technique is used to calculate the normal mode frequencies of the umbra for different values of the horizontal wave number. The nature of the wave modes is examined by decomposing the eigenvectors into longitudinal and transverse components.
ISSN: 0074-1809
Appears in Collections:IIAP Publications

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