Lower‐Hybrid Wave Structures and Interactions With Electrons Observed in Magnetotail Reconnection Diffusion Regions

Wang, Shan; Chen, Li‐Jen; Bessho, Naoki; Ng, Jonathan; Hesse, Michael; Graham, Daniel B.; Le Contel, Olivia; Gershman, Daniel; Giles, Barbara

doi:10.1029/2021JA030109

Title: Lower‐Hybrid Wave Structures and Interactions With Electrons Observed in Magnetotail Reconnection Diffusion Regions

Abstract

Abstract We investigate waves close to the lower‐hybrid frequency in 12 magnetotail reconnection electron diffusion region (EDR) events with guide field levels of near‐zero to 30%. In about half of the events, the wave vector has a small component along the current sheet normal, consistent with known lower‐hybrid drift wave properties, but the perpendicular magnetic field fluctuations can be comparable or greater than the parallel component, a feature unique to the waves inside and adjacent to EDRs. Another new wave property is that the wave vector has a significant component along the current sheet normal in some events and completely along the normal for one event. In 1/4 of the events, the term has a significant contribution to the wave electric field, possibly a feature of lower‐hybrid waves more likely to exist in the diffusion region than further away from the X‐line. Electron temperature variations are correlated with the wave potential, due to wave electric field acceleration and crossings at the corrugated separatrix region with different amounts of mixing between reconnection inflowing and outflowing populations. The latter also leads to the anti‐correlation between parallel and perpendicular temperature components. Using four‐spacecraft measurements, the magnetic field line twisting is demonstrated by themore »« less

Authors:

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Astronomy Department University of Maryland College Park MD USA, NASA Goddard Space Flight Center Greenbelt MD USA
NASA Goddard Space Flight Center Greenbelt MD USA
NASA Ames Research Center Mountain View CA USA
Swedish Institute of Space Physics Uppsala Sweden
Laboratoire de Physique des Plasmas CNRS/Sorbonne Université/Université Paris‐Saclay/Observatoire de Paris/ Ecole Polytechnique Institut Polytechnique de Paris Paris France

Publication Date:: Fri Apr 29 00:00:00 EDT 2022

Research Org.:: Univ. of Maryland, College Park, MD (United States)

Sponsoring Org.:: USDOE Office of Science (SC); National Science Foundation (NSF); National Aeronautics and Space Administration (NASA)

OSTI Identifier:: 1865705

Alternate Identifier(s):: OSTI ID: 1870934; OSTI ID: 1978533

Grant/Contract Number:: SC0016278; AGS-2010231; 80NSSC18K1369; 80NSSC21K1795

Resource Type:: Published Article

Journal Name:: Journal of Geophysical Research. Space Physics

Additional Journal Information:: Journal Name: Journal of Geophysical Research. Space Physics Journal Volume: 127 Journal Issue: 5; Journal ID: ISSN 2169-9380

Publisher:: American Geophysical Union (AGU)

Country of Publication:: United States

Language:: English

Subject:: 79 ASTRONOMY AND ASTROPHYSICS; magnetic reconnection; lower-hybrid wave; electron heating

Citation Formats


                    Wang, Shan, Chen, Li‐Jen, Bessho, Naoki, Ng, Jonathan, Hesse, Michael, Graham, Daniel B., Le Contel, Olivia, Gershman, Daniel, and Giles, Barbara. Lower‐Hybrid Wave Structures and Interactions With Electrons Observed in Magnetotail Reconnection Diffusion Regions.  United States: N. p., 2022. 
Web.  doi:10.1029/2021JA030109.

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                    Wang, Shan, Chen, Li‐Jen, Bessho, Naoki, Ng, Jonathan, Hesse, Michael, Graham, Daniel B., Le Contel, Olivia, Gershman, Daniel, & Giles, Barbara. Lower‐Hybrid Wave Structures and Interactions With Electrons Observed in Magnetotail Reconnection Diffusion Regions.  United States.  https://doi.org/10.1029/2021JA030109

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                    Wang, Shan, Chen, Li‐Jen, Bessho, Naoki, Ng, Jonathan, Hesse, Michael, Graham, Daniel B., Le Contel, Olivia, Gershman, Daniel, and Giles, Barbara. Fri .  
"Lower‐Hybrid Wave Structures and Interactions With Electrons Observed in Magnetotail Reconnection Diffusion Regions".  United States.  https://doi.org/10.1029/2021JA030109.

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@article{osti_1865705,

  title        = {Lower‐Hybrid Wave Structures and Interactions With Electrons Observed in Magnetotail Reconnection Diffusion Regions},

  author       = {Wang, Shan and Chen, Li‐Jen and Bessho, Naoki and Ng, Jonathan and Hesse, Michael and Graham, Daniel B. and Le Contel, Olivia and Gershman, Daniel and Giles, Barbara},

  abstractNote = {Abstract We investigate waves close to the lower‐hybrid frequency in 12 magnetotail reconnection electron diffusion region (EDR) events with guide field levels of near‐zero to 30%. In about half of the events, the wave vector has a small component along the current sheet normal, consistent with known lower‐hybrid drift wave properties, but the perpendicular magnetic field fluctuations can be comparable or greater than the parallel component, a feature unique to the waves inside and adjacent to EDRs. Another new wave property is that the wave vector has a significant component along the current sheet normal in some events and completely along the normal for one event. In 1/4 of the events, the term has a significant contribution to the wave electric field, possibly a feature of lower‐hybrid waves more likely to exist in the diffusion region than further away from the X‐line. Electron temperature variations are correlated with the wave potential, due to wave electric field acceleration and crossings at the corrugated separatrix region with different amounts of mixing between reconnection inflowing and outflowing populations. The latter also leads to the anti‐correlation between parallel and perpendicular temperature components. Using four‐spacecraft measurements, the magnetic field line twisting is demonstrated by the correlated fluctuations in and . The lower‐hybrid wave in the EDR of weak guide field reconnection may be generated near separatrices and penetrate to the mid‐plane or locally generated, and the latter possibility is beyond the prediction of previous reconnection simulations.},

  doi          = {10.1029/2021JA030109},

  journal      = {Journal of Geophysical Research. Space Physics},

  number       = 5,

  volume       = 127,

  place        = {United States},

  year         = {Fri Apr 29 00:00:00 EDT 2022},

  month        = {Fri Apr 29 00:00:00 EDT 2022}

}

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