✦ LIBER ✦

The nature of running penumbral waves

✍ Scribed by Alan H. Nye; John H. Thomas

Publisher: Springer
Year: 1974
Tongue: English
Weight: 773 KB
Volume: 38
Category: Article
ISSN: 0038-0938
DOI: 10.1007/bf00155077

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✦ Synopsis

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 (i) the waves are evanescent and (ii) the vertical velocity is in fact observed (in Ha).

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