Bibcode
Yelles Chaouche, Lotfi; Abdelatif, Toufik E.
Referencia bibliográfica
Solar and Solar-Like Oscillations: Insights and Challenges for the Sun and Stars, 25th meeting of the IAU, Joint Discussion 12, 18 July 2003, Sydney, Australia
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2003
Número de citas
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Número de citas referidas
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Descripción
The linear oscillations of a stratified atmosphere embedded by 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 leaking part of
the energy to the corona. These last modes have been found to be damped
in the horizontal direction and can explain the observed slow modes in
the corona