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Study of the plasma turbulence in the central plasma sheet was performed\udusing the Interball-Tail satellite data. Fluctuations of the plasma bulk\udvelocity in the plasma sheet were deduced from the measurements taken by the\udCorall instrument for different levels of geomagnetic activity and different\udlocations inside the plasma sheet. The events that satisfied the following\udcriteria were selected for analysis: number density 0.1–10 cm<sup>−3</sup>, ion\udtemperature <I>T</I>≥0.3 keV, and average bulk velocity ≤100 km/s. It was\udfound that the plasma sheet flow generally appears to be strongly turbulent,\udi.e. is dominated by fluctuations that are unpredictable. Corresponding\udeddy-diffusion coefficients in Y- and Z-direction in the GSM coordinate\udsystem were derived using the autocorrelation time and rms velocity.\udStatistical studies of variation of the eddy-diffusion coefficients with the\udlocation inside the plasma sheet showed a significant increase in these\udcoefficients in the tailward direction. During substorms this dependence\udshows strong increase of eddy-diffusion in the central part of the plasma\udsheet at the distances of 10–30 Earth's radii. This effect is much stronger\udfor Y-components of the eddy-diffusion coefficient, which could be related\udto the geometry of the plasma sheet, allowing more room for development of\udeddies in this direction

Spatial variation of eddy-diffusion coefficients in the turbulent plasma sheet during substorms