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Electron and Ion Dynamics in Reconnection Diffusion Regions
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DOI：10.1007/s11214-025-01197-z.png)
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Abstract
En 中文
Magnetic reconnection is a fundamental plasma process responsible for the sometimes explosive release of magnetic energy in space and laboratory plasmas. Inside the diffusion regions of magnetic reconnection, the plasma becomes demagnetized and decouples from the magnetic field, enabling the change in magnetic topology necessary to power the energy release over larger scales. Since it was launched in 2015, the Magnetospheric MultiScale (MMS) mission has significantly advanced the understanding of the particle dynamics key to magnetic reconnection by providing high-resolution, in-situ measurements able to resolve ion and electron kinetic scales, i.e. a fraction of a gyroradius, that have confirmed theoretical predictions, revealed new phenomena, and refined existing models. These breakthroughs are critical for understanding not only space plasmas but also laboratory and astrophysical plasmas where magnetic reconnection occurs. In this work, we review the ion and electron dynamics occurring within the diffusion regions, in the inflow, along the separatrices, and downstream of the diffusion regions, in different reconnection configurations: symmetric, asymmetric, antiparallel, and guide field reconnection.
Keywords:
Magnetic reconnection
Ion dynamics
Electron dynamics
Kinetic processes
Electron diffusion region
Ion diffusion region
Symmetric reconnection
Asymmetric reconnection
Antiparallel reconnection
Guide field reconnection
Hall electric and magnetic fields
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