Recent progress on magnetic reconnection by in situ measurements

Wang, Rongsheng; Lu, San; Wang, Shimou; Li, Xinmin; Lu, Quanming

doi:10.1007/s41614-023-00129-0

Rev. Mod. Plasma Phys.

2023

DOI: 10.1007/s41614-023-00129-0

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Recent progress on magnetic reconnection by in situ measurements

Rongsheng Wang,

San Lu,

Shimou Wang

et al.

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2024

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Cited by 3 publications

References 185 publications

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Reviews of Modern Plasma Physics: Volume 7

Kikuchi

2024

Rev. Mod. Plasma Phys.

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Reviews of Modern Plasma Physics: Volume 7

Kikuchi

2024

Rev. Mod. Plasma Phys.

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Energy Conversion Associated with Intermittent Currents in the Magnetosheath Downstream of the Quasi-Parallel Shock

Li,

Wang,

et al. 2024

Magnetochemistry

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Using the data from the Magnetospheric Multiscale (MMS) mission, we studied the energy conversion between electromagnetic fields and particles (ions and electrons) in a spacecraft rest frame inside a turbulent magnetosheath downstream of the quasi-parallel shock. The results show that the energy conversion was highly intermittent in the turbulent magnetosheath, and the perpendicular electric fields dominated the energy conversion process. The energy conversion among the electromagnetic fields, ions, and electrons was related to the current intensity. In the region with weak current, the ions gained energy from electromagnetic fields, while the electron energy was released and transferred into electromagnetic fields. In contrast, in the intense current region, the energy of ions was transferred into the electromagnetic fields, but the electrons gained energy from electromagnetic fields. The results quantitatively established the relationship between energy conversion rate and current density and revealed that the energy conversion among the electromagnetic fields, ions, and electrons was related to the local current intensity inside the shocked turbulence.

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A Bifurcated Reconnecting Current Sheet in the Turbulent Magnetosheath

Wang,

Huang

et al. 2024

Magnetochemistry

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We report the Magnetospheric Multiscale (MMS) observation of a bifurcated reconnecting current sheet in Earth’s dayside magnetosheath. Typical signatures of the ion diffusion region, including sub-Alfvénic demagnetized ion outflow, super-Alfvénic electron flows, Hall magnetic fields, electron heating, and energy dissipation, were found when MMS traversed the current sheet. The weak ion exhaust at the current sheet center was bounded by two current peaks in which super-Alfvénic electron flow directed toward and away from the X line were observed, respectively. Both off-center current peaks were primarily carried by electrons, one of which was supported by field-aligned current, while the other was mainly supported by current driven by electric field drift. The two current peaks also exhibit other differences, including electron heating, electron pitch angle distributions, electron nongyrotropy, energy dissipation, and magnetic field curvature. An ion-scale magnetic flux rope was detected between the two current peaks where electrons showed field-aligned bidirectional distribution, in contrast to field-aligned distribution parallel to the magnetic field in two current peaks. The observed current sheet was embedded in a background shear flow. This shear flow worked together with the guide field and asymmetric field and density to affect the electron dynamics. Our results reveal the reconnection properties in this special plasma and field regime which may be common in turbulent environments.

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Recent progress on magnetic reconnection by in situ measurements

Cited by 3 publications

References 185 publications

Reviews of Modern Plasma Physics: Volume 7

Reviews of Modern Plasma Physics: Volume 7

Energy Conversion Associated with Intermittent Currents in the Magnetosheath Downstream of the Quasi-Parallel Shock

A Bifurcated Reconnecting Current Sheet in the Turbulent Magnetosheath

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