双极扩散
电场
电流(流体)
电流
当前工作表
领域(数学)
工程物理
物理
材料科学
凝聚态物理
磁场
核物理学
电子
量子力学
磁流体力学
热力学
数学
纯数学
作者
Ami DuBois,Chris Crabtree,G. Ganguli,D. Malaspina,W. E. Amatucci
标识
DOI:10.1103/physrevlett.129.105101
摘要
Spacecraft data reveal a nonuniform ambipolar electric field transverse to the magnetic field in a thin current sheet in Earth's magnetotail that leads to intense E×B velocity shear and nongyrotropic particle distributions. The E×B drift far exceeds the diamagnetic drift and thus drives observed lower hybrid waves. The shear-driven waves are localized to the magnetic field reversal region and are therefore ideally suited for the anomalous dissipation necessary for reconnection. It also reveals substructures embedded in the current density, indicating a compressed current sheet.
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