Decomposing the electric field (E) into the contributions from generalized Ohm's law provides key insight into both nonlinear and dissipative dynamics across the full range of scales within a plasma. Using high‐resolution, multispacecraft measurements of three intervals in Earth's magnetosheath from the Magnetospheric Multiscale mission, the influence of the magnetohydrodynamic, Hall, electron pressure, and electron inertia terms from Ohm's law, as well as the impact of a finite electron mass, on the turbulent E spectrum are examined observationally for the first time. The magnetohydrodynamic, Hall, and electron pressure terms are the dominant contributions to E over the accessible length scales, which extend to scales smaller than the electron gyroradius at the greatest extent, with the Hall and electron pressure terms dominating at sub‐ion scales. The strength of the nonideal electron pressure contribution is stronger than expected from linear kinetic Alfvén waves and a partial antialignment with the Hall electric field is present, linked to the relative importance of electron diamagnetic currents in the turbulence. The relative contribution of linear and nonlinear electric fields scale with the turbulent fluctuation amplitude, with nonlinear contributions playing the dominant role in shaping E for the intervals examined in this study. Overall, the sum of the Ohm's law terms and measured E agree to within ∼20% across the observable scales. These results both confirm general expectations about the behavior of E in turbulent plasmas and highlight features that should be explored further theoretically.

中文翻译：

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磁层多尺度观测到的磁欧石湍流中各种广义欧姆定律项的比较分析

将电场（E）分解为广义欧姆定律的贡献，从而可以洞悉整个等离子体尺度范围内的非线性和耗散动力学。使用高分辨率，多空间飞行器对磁层多尺度任务进行的三个磁层间间隔测量，磁流体动力学，霍尔，电子压力和电子惯性项对欧姆定律的影响以及有限电子质量的影响，首次对湍流E谱进行了观测。磁流体动力学，霍尔和电子压力项是对E的主要贡献在可访问的长度尺度上，该尺度最大程度地扩展到小于电子陀螺半径，而霍尔和电子压力项在亚离子尺度上占主导地位。非理想电子压力贡​​献的强度强于线性动力学Alfvén波所预期的强度，并且存在与霍尔电场的部分反对准，这与湍流中电子反磁性电流的相对重要性有关。线性和非线性电场的相对贡献随湍流波动幅度而定，在此研究中，非线性贡献在塑造E方面起主要作用。总体而言，欧姆定律项和测得的E之和同意在整个可观察范围内的20％以内。这些结果既证实了人们对湍流等离子体中E行为的普遍期望，也突出了应从理论上进一步探索的特征。