Journal
ASTROPHYSICAL JOURNAL
Volume 936, Issue 1, Pages -Publisher
IOP Publishing Ltd
DOI: 10.3847/1538-4357/ac7da6
Keywords
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Funding
- UK Science and Technology Facilities Council (STFC) [ST/T00018X/1]
- Belgian Federal Science Policy Office (BELSPO) [4000134474]
- KULeuven Bijzonder Onderzoeksfonds (BOF) under the C1 project TRACESpace
- European Union's project DEEP-SEA [955606]
- NASA [80NSSC19K0841]
- BEIS capital funding via STFC capital grant [ST/K000373/1, ST/R002363/1, ST/P002307/1, ST/R002452/1]
- STFC DiRAC Operations grant [ST/R001014/1]
- STFC operations grant [ST/R00689X/1]
- CINECA under the program Accordo Quadro MoU INAF-CINECA Nuove frontiere in Astrofisica: HPC e Data Exploration di nuova generazione [INA20_C6A55]
- Project HPC-EUROPA3 [INFRAIA-2016-1-730897]
- EC Research Innovation Action under the H2020 Programme [HPC177WO5I, HPC17MTH1N]
- Fondazione Cassa di Risparmio di Firenze under the project HIPERCRHEL
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A high-resolution, 2D, fully kinetic numerical simulation was conducted to investigate the interplay between turbulence, magnetic reconnection, and particle heating in the near-Sun solar wind. The power spectra of the turbulent plasma and electromagnetic fluctuations show multiple power-law intervals down to scales smaller than the electron gyroradius. Magnetic reconnection was observed to occur in correspondence of current sheets with interacting ion-scale vortices, leading to electron heating with the presence of strong turbulence.
We perform a high-resolution, 2D, fully kinetic numerical simulation of a turbulent plasma system with observation-driven conditions, in order to investigate the interplay between turbulence, magnetic reconnection, and particle heating from ion to subelectron scales in the near-Sun solar wind. We find that the power spectra of the turbulent plasma and electromagnetic fluctuations show multiple power-law intervals down to scales smaller than the electron gyroradius. Magnetic reconnection is observed to occur in correspondence of current sheets with a thickness of the order of the electron inertial length, which form and shrink owing to interacting ion-scale vortices. In some cases, both ion and electron outflows are observed (the classic reconnection scenario), while in others-typically for the shortest current sheets-only electron jets are present (electron-only reconnection). At the onset of reconnection, the electron temperature starts to increase and a strong parallel temperature anisotropy develops. This suggests that in strong turbulence electron-scale coherent structures may play a significant role for electron heating, as impulsive and localized phenomena such as magnetic reconnection can efficiently transfer energy from the electromagnetic fields to particles.
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