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Magnetic flux tubes such as those in the solar corona are subject to a numberof instabilities. Important among them is the kink instability which plays acentral part in the nanoflare theory of coronal heating, and for this reason innumerical simulations it is usually induced by tightly-controlled perturbationsand studied in isolation. In contrast, we find that when disturbances areintroduced in our magnetohydrodynamic flux tube simulations by dynamic twistingof the flow at the boundaries fluting modes of instability are readily excited.We also find that the flute instability, which has been theorised but rarelyobserved in the coronal context, is strongly enhanced when plasma viscosity isassumed anisotropic. We proceed to investigate the co-existence and competitionbetween flute and kink instabilities for a range of values of the resistivityand of the parameters of the anisotropic and isotropic models of viscosity. Weconclude that while the flute instability cannot prevent the kink fromultimately dominating, it can significantly delay its development especially atstrong viscous anisotropy induced by intense magnetic fields.

Flute and kink instabilities in a dynamically twisted flux tube with anisotropic plasma viscosity