On the dependence of the Farley-Buneman turbulence level on ionospheric electric field

Physics

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Atmospheric Turbulence, E Region, Ionospheric Currents, Ionospheric Electron Density, Backscattering, Coherent Radar, Eiscat Radar System (Europe)

Scientific paper

The mean electron density fluctuation amplitude of the Farley-Buneman E-region wave turbulence has been determined using coherent radar backscatter intensity and drift velocity measurements made with the Scandinavian twin auroral radar experiment system, together with ionospheric electric field and electron density measurements obtained with the EISCAT incoherent scatter radar facility. The observations made with the two radar systems were obtained in nearly a common volume in the E-region. It is shown that the turbulence level increases from 1.5 to 2.7 percent as the electric field intensity increases from 20 to 35 mV/m. It stays approximately constant for E of greater than 35 mV/m. This increase and saturation of the wave turbulence level is discussed in the frame of existing theories.

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