Solar-Terrestrial Physics Solar-Terrestrial Physics Solar-Terrestrial Physics 2500-0535 85255 10.12737/stp-111202503 Results of current research Results of current research Results of current research Dependence of eddy diffusion coefficient on plasma parameter β in Earth’s magnetotail Dependence of eddy diffusion coefficient on plasma parameter β in Earth’s magnetotail https://orcid.org/0009-0000-1955-8176 Найко Даниил Юрьевич Naiko Daniil Yurievich https://orcid.org/0000-0003-2509-8166 Овчинников Илья Львович Ovchinnikov Ilya L'vovich ilya@psn.ru

кандидат физико-математических наук;

candidate of physical and mathematical sciences;

 https://orcid.org/0000-0001-6980-3993 Антонова Елизавета Евгеньевна Antonova Elizaveta Evgenievna

доктор физико-математических наук;

doctor of physical and mathematical sciences;

 Московский государственный университет имени М.В.Ломоносова Lomonosov Moscow State University Институт космических исследований Российской академии наук Institute of Space Researches of the Russian Academy of Sciences 26 03 2025 26 03 2025 11 1 27 35 09 07 2024 23 10 2024 https://zh-szf.ru/en/nauka/article/85255/view

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.

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 magnetospheric turbulence turbulent transport coefficients of eddy diffusion The work was financially supported by the Russian Science Foundation (Grant No. 23-22-00076) [https://rscf.ru/project/23-22-00076/] The work was financially supported by the Russian Science Foundation (Grant No. 23-22-00076) [https://rscf.ru/project/23-22-00076/]

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