Abstract
The dispersion and spectral characteristics of low-frequency fluctuations excited in collisional toroidal magnetoplasma is reported. The plasma produced under the operating conditions have magnetized electrons, unmagnetized ions, E∥∇n⊥B and ∇n antiparallel to effective gravity g. The low frequency (<ion-gyrofrequency) electrostatic fluctuations observed in density and potential are turbulent, travel mainly in azimuthal direction and are excited by the cross-field instability. The spectral indices of the k spectra for the density and potential fluctuations, as computed using pair probe technique, are −3.8±0.5 and −6.0±0.6, respectively. These results are in good agreement with the in situ measurements of fluctuations in equatorial electrojet and the earlier laboratory experiments on the cross-field instability. Numerical simulations and nonlinear theories, however, predict flatter spectra.
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