ИСТИНА

The results of a preliminary analysis of the distribution of eddy diffusion coefficients depending on the coordinates in the plasma sheet of the Earth's magnetosphere using publicly available Magnetospheric Multiscale Mission (MMS) data are presented. The data of measurements of the hydrodynamic velocity of plasma ions with FPI/DIS devices with a time resolution of 1/4.5 s-1 were used to calculate the turbulent diffusion coefficient. The localization of the satellites inside the plasma sheet was fixed by the concentration and temperature of plasma ions according to the data of the same instruments and the value of the plasma parameter β, which was calculated using the magnetic field according to the data of the FGM instruments. The results obtained by Stepanova et al. (2011) during a similar analysis of THEMIS mission data were confirmed. The dependence of the turbulent diffusion coefficient on the interplanetary magnetic field and geomagnetic indices is analyzed according to OMNI data. It is shown that for the southern orientation of the interplanetary magnetic field, the value of the coefficients of turbulent diffusion is several times greater than for the northern one. There is also a similar dependence of the diffusion coefficient on the level of geomagnetic activity.