TURBULENT CORONAL HEATING .2. TWISTED FLUX TUBE

Inverarity et al. (1994) extended the model of Hevyaerts & Priest (199 2) for turbulent coronal heating in a sheared arcade, again achieving the observed levels of heating but with improved mathematical consiste ncy. A similar model for heating in a flux tube twisted by vortical ph otospheric motions is here developed. Two models for the turbulence ar e investigated: three-dimensional, helically isotropic turbulence and two-dimensional turbulence, isotropic in the plane perpendicular to th e background field. It is found that the three-dimensional turbulence model can reproduce the observed levels of coronal heating. However, t he purely two-dimensional model cannot be used when modelling steady-s tate heating.