Core and edge turbulences were measured by Langmuir probe arrays in th
e KT-5C tokamak plasma. The radial wavenumber spectra show a quasimode
like structure which results in a net radial outward propagation of t
he turbulent fluctuations. The measured fluctuation levels and wave ac
tion fluxes are in good agreement with model predictions by Mattor et
al., suggesting that drift wave propagation could be a source of edge
turbulence.