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S.S. Hasan, W. Kalkofen (CfA)
We examine the excitation of oscillations in the magnetic network of the Sun through the buffeting action of external granules on vertical magnetic flux tubes extending through the photosphere. We assume that the granules motions are turbulent with an extended Kolmogorov energy spectrum. We model the interaction of the external flow field with the flux tube in terms of the Klein-Gordon equation, that is solved analytically as an initial value problem for transverse (kink) and longitudinal (waves). We compute the wave energy flux in both the modes for various magnetic field strengths and compare these results with our previous calculations in which the network oscillations are excited in short duration pulses by the occasional rapid motions of granules. We examine the consequences of our results for coronal heating.
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