Spatial Distribution of the Eddy Diffusion Coefficient in the Plasma Sheet of Earth’s Magnetotail and Its Dependence on the Interplanetary Magnetic Field and Geomagnetic Activity Based on MMS Satellite Data

IF 0.7 4区地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS

Geomagnetism and Aeronomy Pub Date : 2024-04-26 DOI:10.1134/S0016793223600996

D. Yu. Naiko, I. L. Ovchinnikov, E. E. Antonova

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Abstract

The article presents the results of a statistical analysis of the distribution of the eddy diffusion coefficient depending on the coordinates in the plasma sheet of Earth’s magnetosphere based on data from the Magnetospheric Multiscale Mission satellite system (MMS) for the period from 2017 to 2022. The localization of satellites inside the plasma sheet was recorded from the concentration and temperature of plasma ions according to the data of the same instruments and the value of plasma parameter β. Significant anisotropy of the eddy diffusion coefficient was revealed. The dependence of the eddy diffusion coefficient on the interplanetary magnetic field is analyzed, showing that with the southern orientation of the interplanetary magnetic field, the eddy diffusion coefficients are 1.5–2 times greater than with the northern orientation. It is also shown that under disturbed geomagnetic conditions (SML < –200 nT), the eddy diffusion coefficients are several times greater than under quiet geomagnetic conditions (SML > –50 nT).

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基于 MMS 卫星数据的地球磁尾等离子体薄片涡扩散系数的空间分布及其与行星际磁场和地磁活动的关系

摘要文章介绍了根据磁层多尺度任务卫星系统（MMS）2017年至2022年期间的数据，对地球磁层等离子体薄片内不同坐标的涡扩散系数分布情况进行统计分析的结果。根据相同仪器的数据和等离子体参数β值，通过等离子体离子的浓度和温度记录了卫星在等离子体片内的定位情况。分析了涡扩散系数与行星际磁场的关系，结果表明，行星际磁场南向时，涡扩散系数是北向时的 1.5-2 倍。研究还表明，在干扰地磁条件下（SML < -200 nT），涡扩散系数是安静地磁条件下（SML > -50 nT）的数倍。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Geomagnetism and Aeronomy Earth and Planetary Sciences-Space and Planetary Science

CiteScore

1.30

自引率

33.30%

发文量

审稿时长

4-8 weeks

期刊介绍： Geomagnetism and Aeronomy is a bimonthly periodical that covers the fields of interplanetary space; geoeffective solar events; the magnetosphere; the ionosphere; the upper and middle atmosphere; the action of solar variability and activity on atmospheric parameters and climate; the main magnetic field and its secular variations, excursion, and inversion; and other related topics.