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In this paper we propose a new mechanism describing the initial spike ofgiant flares in the framework of the starquake model. We investigate theevolution of a plasma on a closed magnetic flux tube in the magnetosphere of amagnetar in the case of a sudden energy release and discuss the relationshipwith observations of giant flares. We perform one-dimensional numericalsimulations of the relativistic magnetohydrodynamics in Schwarzschild geometry.We assume energy is injected at the footpoints of the loop by a hot starsurface containing random perturbations of the transverse velocity. Alfv\'enwaves are generated and propagate upward, accompanying very hot plasma that isalso continuously heated by nonlinearly generated compressive waves. We findthat the front edges of the fireball regions collide at the top of the tubewith their symmetrically launched counterparts. This collision results in anenergy release which can describe the light curve of initial spikes of giantflares.

The Evolution of High Temperature Plasma in Magnetar Magnetospheres and its Implications for Giant Flares