Title:
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Waves in the Magnetised Solar Atmosphere I: Basic Processes and Internetwork 
Oscillations

Authors:
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Rosenthal, C.S, Bogdan, T.J., Carlsson, M., Dorch, S.B.F., Hansteen, V., 
McIntosh, S., McMurry, A., Nordlund, Å. and Stein, R.F.

Abstract:
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We have modeled numerically the propagation of waves through magnetic 
structures in a stratified atmosphere. We first simulate the propagation of 
waves through a number of simple, exemplary field geometries in order to 
obtain a better insight into the effect of differing field structures on the 
wave speeds, amplitudes, polarizations, direction of propagation etc. with a 
view to understanding the wide variety of wave-like and oscillatory processes 
observed in the solar atmosphere.
As a particular example, we then apply the method to oscillations in the 
chromospheric network and internetwork. We find that, in regions where the 
field is significantly inclined to the vertical, refraction by the rapidly 
increasing phase speed of the fast modes results in total internal reflection 
of the waves at a surface whose altitude is highly variable. We conjecture a 
relationship between this phenomenon and the observed spatio-temporal 
intermittancy of the oscillations. By contrast, in regions where the field is 
close to vertical the waves continue to propagate upward, channeled along the 
field lines but otherwise largely unaffected by the field.

Appeared in:
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ApJ 564, 508-524, 2002