ON THE GENERATION OF NONLINEAR MAGNETIC TUBE WAVES IN THE SOLAR ATMOSPHERE - II - LONGITUDINAL TUBE WAVES

The nonlinear time-dependent response to external pressure fluctuation s acting on a thin vertical magnetic flux tube embedded in the solar a tmosphere is investigated numerically. The continuous and impulsive fl uctuations are imposed on the tube at different atmospheric heights an d the resulting longitudinal tube wave energy fluxes are calculated fo r an observationally established range of velocity amplitudes and tube magnetic fields. The obtained results show that typical wave energy f luxes carried by nonlinear longitudinal tube waves are of the order of 2 . 10(8) erg/cm(2)s, which is roughly a factor of 30 less than the f lux for transverse waves. In contrast to our linear analytical results the generated nonlinear longitudinal tube wave fluxes can be up to an order of magnitude higher.