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We analyse transverse oscillations of a coronal loop excited by continuousmonoperiodic motions of the loop footpoint at different frequencies in thepresence of gravity. Using the MPI-AMRVAC code, we perform three-dimensionalnumerical magnetohydrodynamic simulations, considering the loop as a magneticflux tube filled in with denser, hotter, and gravitationally stratified plasma.We show the resonant response of the loop to its external excitation andanalyse the development of the Kelvin-Helmholtz instability at differentheights. We also study the spatial distribution of plasma heating due totransverse oscillations along the loop. The positions of the maximum heatingare in total agreement with those for the intensity of the Kelvin-Helmholtzinstability, and correspond to the standing wave anti-nodes in the resonantcases. The initial temperature configuration and plasma mixing effect appear toplay a significant role in plasma heating by transverse footpoint motions. Inparticular, the development of the Kelvin-Helmholtz instability in a hotterloop results in the enhancement of the mean plasma temperature in the domain.

Coronal loop transverse oscillations excited by different driver frequencies