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Solar Physics

, Volume 38, Issue 2, pp 399–413 | Cite as

The nature of running penumbral waves

  • Alan H. Nye
  • John H. Thomas
Article
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Revised:

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

Keywords

Magnetic Field Compressibility Vertical Velocity Wave Energy Photospheric Level 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© D. Reidel Publishing Company 1974

Authors and Affiliations

  • Alan H. Nye
    • 1
  • John H. Thomas
    • 1
  1. 1.Max-Planck-Institut für Physik und AstrophysikMunichGermany

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