Electromagnetic viscosity supported anomalous electric field in the electron diffusion region of collisionless magnetic reconnection.

ABSTRACT: Kinetic-scale electromagnetic fluctuations are frequently observed in the reconnection electron diffusion region. However, their potential to accelerate magnetic reconnection through anomalous effects remains a topic of debate, with a lack of direct in-situ observational evidence. Using the unprecedented high-resolution data from Magnetospheric Multiscale mission, we directly and systematically calculate the secular field-particle energy exchange rate and anomalous electric fields associated with electromagnetic fluctuations within 13 electron diffusion regions observed in Earth's magnetotail. Our findings reveal that the electromagnetic anomalous viscosity is the primary contributor to the anomalous electric field induced by electromagnetic fluctuations within the electron diffusion regio

SUBMITTER: Zhong ZH 

PROVIDER: S-EPMC12658115 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature