Dynamical processes in flux tubes and their role in chromospheric heating

We model the dynamical interaction between magnetic flux tubes and granules in the solar photosphere which leads to the excitation of transverse (kink ) and longitudinal (sausage) tube waves. The investigation is motivated by the interpretation of network oscillations in terms of flux tube waves. The calculations show that for magnetic field strengths typical of the network , the energy flux in transverse waves is higher than in longitudinal waves by an order of magnitude. But for weaker fields, such as those that might b e found in internetwork regions, the energy fluxes in the two modes are com parable. Using observations of footpoint motions, the energy flux in transv erse waves is calculated and the implications for chromospheric healing are pointed out.