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首页> 外文期刊>Journal of geophysical research >Electron heating in the exhaust of magnetic reconnection with negligible guide field
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Electron heating in the exhaust of magnetic reconnection with negligible guide field

机译：Electron heating in the exhaust of magnetic reconnection with negligible guide field

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abstract_textpElectron heating in the magnetic reconnection exhaust is investigated with particle-in-cell simulations, space observations, and theoretical analysis. Spatial variations of the electron temperature (T-e) and associated velocity distribution functions (VDFs) are examined and understood in terms of particle energization and randomization processes that vary with exhaust locations. Inside the electron diffusion region (EDR), the electron temperature parallel to the magnetic field (T-e vertical bar parallel to) exhibits a local minimum and the perpendicular temperature (T-e perpendicular to) shows a maximum at the current sheet midplane. In the intermediate exhaust downstream from the EDR and far from the magnetic field pileup region, T-e perpendicular to/T-e parallel to is close to unity and T-e is approximately uniform, but the VDFs are structured: close to the midplane, VDFs are quasi-isotropic, whereas farther away from the midplane, VDFs exhibit field-aligned beams directed toward the midplane. In the far exhaust, T-e generally increases toward the midplane and the pileup region, and the corresponding VDFs show counter-streaming beams. A distinct population with low v(parallel to) and high v(perpendicular to) is prominent in the VDFs around the midplane. Test particle results show that the magnetic curvature near the midplane produces pitch angle scattering to generate quasi-isotropic distributions in the intermediate exhaust. In the far exhaust, electrons with initial high v(parallel to) (v(perpendicular to)) are accelerated mainly through curvature (gradient-B) drift opposite to the electric field, without significant pitch angle scattering. The VDF structures predicted by simulations are observed in magnetotail reconnection measurements, indicating that the energization mechanisms captured in the reported simulations are applicable to magnetotail reconnection with negligible guide field./p/abstract_text

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