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Solar Physics

, Volume 229, Issue 2, pp 255–271 | Cite as

MAG Waves in Sunspots Umbrae: Slow Waves Leaking to the Corona

  • Lotfi Yelles ChaoucheEmail author
  • Toufik E. Abdelatif
Article

Abstract

The linear oscillations of a stratified atmosphere embedded in a uniform vertical magnetic field are studied here. We use a simple theoretical model, formed by the superposition of two isothermal layers, representing, respectively, i) the photosphere and the chromosphere, and ii) the corona. The bottom layer behaves, for some modes, as a resonant cavity where MAG waves are semi-trapped. We find the existence of two types of modes: 1) Fast modes which are trapped below the transition layer, 2) Mixed modes which are resonant modes in the first layer and leak part of the energy to the corona. These mixed modes have been found to be damped in the horizontal direction and can explain the observed slow modes in the corona.

Keywords

Magnetic Field Horizontal Direction Bottom Layer Slow Wave Transition Layer 
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

© Springer Science + Business Media, Inc. 2005

Authors and Affiliations

  1. 1.Département d'Astronomie et Astrophysique(CRAAG)AlgiersAlgeria

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