Normalization Scheme

Let be a typical variation lengthscale in the resonant layer. It is convenient to adopt the following normalization scheme that renders all quantities in the drift-MHD fluid equations dimensionless: , , , , , , , , , , , , and . Equations (4.7)–(4.13) and (4.20)–(4.22) yield the following set of normalized drift-MHD fluid equations:

where and Here, use has been made of some standard vector identities.