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On the reflection of Alfvén waves in an ideal magnetoatmosphere. (English) Zbl 0904.76096

Summary: We develop a linearized theory of magnetoatmospheric waves where the restoring forces are those of compressibility and magnetic pressure. An equation for resonance is derived. Reflection and tunneling of upward propagating Alfvén waves in an ideal magnetoatmosphere are considered. It is shown that the magnetic field produces a reflecting nonabsorbing critical layer. Below the critical layer, the solution of the problem can be written as a linear combination of an upward and a downward propagating wave and above it the solution decays exponentially with the altitude. The location of the critical layer and the magnitude of the reflection coefficient are determined, and the conclusions are discussed in connection with the heating mechanism of the solar atmosphere.

MSC:

76W05 Magnetohydrodynamics and electrohydrodynamics
86A10 Meteorology and atmospheric physics
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