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Title:
The nature of running penumbral waves
Authors:
Nye, A. H.; Thomas, J. H.
Publication:
Solar Physics, vol. 38, Oct. 1974, p. 399-413. Navy-supported research. (SoPh Homepage)
Publication Date:
10/1974
Category:
Solar Physics
Origin:
STI
NASA/STI Keywords:
Astronomical Models, Magnetoacoustic Waves, Penumbras, Solar Atmosphere, Sunspots, Wave Propagation, Atmospheric Models, Buoyancy, Chromosphere, Compressibility, Photosphere, Solar Magnetic Field, Vertical Motion
DOI:
10.1007/BF00155077
Bibliographic Code:
1974SoPh...38..399N

Abstract

A model of a sunspot penumbra, including the effects of magnetic field, compressibility, and buoyancy, is studied in order to identify the mode of running penumbral waves. It is found that the penumbral waves may be identified with gravity-modified magneto-acoustic waves of the 'plus' type that are vertically trapped at photospheric levels. Although most of the wave energy is contained in the penumbral photosphere and subphotosphere, the maximum vertical velocity occurs in the chromosphere where the waves are evanescent and the vertical velocity is in fact observed (in H-alpha).

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