Solar Physics Russian The current instability of alfven waves in coronal loops is considered. It is shown, that such generation mechanism of Alfven waves is very effective and can lead to development of low-frequency perturbations even in the case of very small currents, that can promote reconnection of magnetic fields and development of a flash. The low-frequency turbulence, originating in this situation, can promote also to the processes of heating and acceleration of particles. longitudinal currents, Alfven waves, solar atmosphere