Due to its constant phase with altitude, is is most efficient to drive coherents winds at dynamo layer height, while the winds of the internal modes interfere destructively at various heighs Forbes, J.M., J. Geophys.Res.
Due to its constant phase with altitude, is is most efficient to drive coherent winds at dynamo layer height Kato, S., J. Geophys. Res., 71,3211,1966, while the winds of the internal modes interfere destructively at various heights Forbes, J.M., J. Geophys.Res.