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We investigate the onset of pressure driven toroidal mode instabilities inaccretion mounds on neutron stars by 3D MHD simulations using the PLUTO MHDcode. Our results confirm that for mounds beyond a threshold mass,instabilities form finger like channels at the periphery, resulting in massloss from the magnetically confined mound. Ring like mounds with hollowinterior show the instabilities at the inner edge as well. We perform thesimulations for mounds of different sizes to investigate the effect of themound mass on the growth rate of the instabilities. We also investigate theeffect of such instabilities on observables such as cyclotron resonantscattering features and timing properties of such systems.

MHD instabilities in accretion mounds - II. 3D simulations