  Corrected analytical solutions describing the enhanced phase mixing of Alfven
waves propagating in divergent stratified coronal structures are presented.
These show that the enhanced phase mixing mechanism can dissipate Alfven waves
at heights less than half that is predicted by the previous analytical
solutions. The enhanced phase mixing of 0.1 Hz harmonic Alfven waves
propagating in strongly divergent, H_b=5 Mm, stratified coronal structures,
H_rho=50 Mm, can fulfill 100% of an active region heating requirement, by
generating viscous heating fluxes of F_H~2100 J /m^2 /s. The Alfven waves in
this configuration are fully dissipated within 20 Mm, which is six times lower
than would occur as a result of standard phase mixing in uniform magnetic
fields. This results in the heating scale height, s_H, being lowered by a
factor of six, to less than half of an active regions density scale height.
Using the corrected analytical solutions it was found that, for a given wave
frequency, the generation of a heating scale height of s_H<=50 Mm, by enhanced
phase mixing in strongly divergent magnetic fields, requires a shear viscosity
eight orders of magnitude lower, than required by standard phase mixing in
uniform magnetic fields. It was also found that the enhanced phase mixing of
observable, 0.01 rads /s Alfven waves, in strongly divergent magnetic fields,
H_b=5 Mm, can generate heating scale heights within a density scale height,
H_rho=50 Mm, using classical Braginskii viscosity. It is therefore not
necessary to invoke anomalous viscosity in corona, if phase mixing takes place
in strongly divergent magnetic fields. This study shows that the importance of
enhanced phase mixing as a mechanism for dissipating Alfven waves in the solar
corona (a stratified and divergent medium), has been seriously underestimated.
