Kinetic and hydrodynamic analyses both predict that long wavelength electrostatic modes in tokamaks may be categorized as a destabilized ion acoustic mode. Ion Landau damping is essentially nullified by the ion magnetic drift for modes propagating in the electron diamagnetic drift (>0). The anomalous electron thermal diffusivity estimated in terms of the mixing length theory scales with the safety factor q and resembles the ion diffusivity in the plateau regime varies asevaries as 1/BB
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