Anomalous resistivity and electron heating by lower hybrid drift waves inside reconnecting current sheets

Yoo, Jongsoo; Ji, Hantao; Shi, Peiyun; Bose, Sayak; Ng, Jonathan; Chen, Li-Jen; Yamada, Masaaki

doi:10.1063/5.0271730

Anomalous resistivity and electron heating by lower hybrid drift waves inside reconnecting current sheets

Journal Article · Tue Jun 24 00:00:00 EDT 2025 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0271730· OSTI ID:2586601

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Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States); Princeton Univ., NJ (United States)
Univ. of Maryland, College Park, MD (United States)
NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)

Inside an electron diffusion region of laboratory reconnection experiments, the quasi-electrostatic lower hybrid drift wave (ES-LHDW) is observed when a significant guide field component is present. Through direct measurement of the anomalous drag term and quasilinear analysis, it is shown that ES-LHDW can account for approximately 20% of the mean reconnection electric field in a case with moderate guide field. This value exceeds the contribution from classical resistivity, which is around 10%. The effects of the Lorentz force term, often neglected for electrostatic waves, are crucial for the observed correlation between electric field and density fluctuations. Anomalous electron heating by the perturbed current and resistivity (2.6 MW/m³) also surpasses the classical Ohmic heating, which is about 2.0 MW/m³. For the case with a high guide field, significantly higher local electron temperatures were observed during periods of strong ES-LHDW activity. A statistical analysis further supports electron heating by LHDW, showing a larger increase in electron temperature with a high guide field. Finally, data from the Magnetospheric Multiscale mission provide evidence of Landau damping of ES-LHDW, suggesting that ES-LHDW may contribute to the generation of nonthermal electrons along the direction parallel to the magnetic field.

View Accepted Manuscript (DOE)

Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); National Aeronautics and Space Administration (NASA)

Grant/Contract Number:: AC02-09CH11466

OSTI ID:: 2586601

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 6 Vol. 32; ISSN 1070-664X; ISSN 1089-7674

Publisher:: AIP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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