A stationary spectrum in the frequency range much below the ion cyclotron frequency is obtained for a strongly turbulent nonuniform plasma. The $\omega$-integrated $k$ spectrum is given by $k^{1.8}{(1+k^2)}^{-2.2\mathrm{}}$, while the width of the frequency spectrum is proportional to $k^3{(1+k^2)}^{-1\mathrm{}}$, where $k$ is normalized by $\frac{c_s}{{\omega }_{\mathrm{ci}}}$. The result compares well with the recently observed spectrum in the ATC tokamak.

• Received 15 November 1976

DOI:https://doi.org/10.1103/PhysRevLett.39.205