Russian Federation
Pushchino, Moscow, Russian Federation
Institute of Space Researches of the Russian Academy of Sciences
Moscow, Moscow, Russian Federation
UDK 52-854 Магнитосфера
UDK 533.951.7 Турбулентность плазмы
UDK 520.64 Плазменные анализаторы (in situ)
UDK 52-14 Результаты анализа и оценки наблюдений и измерений
The work analyzes dependences of eddy diffusion coefficients in the X, Y, and Z directions of the GSM coordinate system on the plasma parameter β, taking into account the distance from Earth, the direction of the interplanetary magnetic field, and conditions of geomagnetic activity in the magnetotail according to MMS mission data. These parameters are determined by root-mean-square velocities of ions and their autocorrelation time. Eddy diffusion coefficients characterize the magnitude of turbulent transport in the magnetotail and are the parameters of the model of turbulent plasma sheet. We have analyzed more than 20000 12-min intervals during which the MMS satellites were located within a region with plasma density more than 0.1 cm–3 and average ion energy more than 0.5 keV. It is shown that as the plasma parameter increases, the eddy diffusion coefficients increase as well. This increase stops at β~1. Analysis of the relative contribution of changes in root-mean-square velocity and autocorrelation time to the eddy diffusion coefficient has revealed that there is no significant dependence on autocorrelation time.
magnetospheric turbulence, turbulent transport, coefficients of eddy diffusion
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