Turbulent
eddy dissipation rate is estimated using an algorithm developed by Sand (Sand et al. 1976), based on earlier work
described in MacCready (1962). The approach
is based on the spectral properties of homogeneous turbulence in the inertial subrange. Basically a
Fast-Fourier transform of the high-resolution true air speed record is fit to
the spectral form expected for homogeneous isotropic turbulence and the result used to
infer the eddy dissipation rate. As with the vertical wind calculation, the
turbulent eddy dissipation rate calculation is valid only in straight-and-level
non-accelerating flight.