High‐Frequency Wave Generation in Magnetotail Reconnection: Nonlinear Harmonics of Upper Hybrid Waves
Abstract MMS3 spacecraft passed the vicinity of the electron diffusion region of magnetotail reconnection on 3 July 2017, observing discrepancies between perpendicular electron bulk velocities and E→×B→ drift, and agyrotropic electron crescent distributions. Analyzing linear wave dispersions, Burch...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2019-07-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2019GL083361 |
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| _version_ | 1850126459057733632 |
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| author | Kyunghwan Dokgo Kyoung‐Joo Hwang James L. Burch Eunjin Choi Peter H. Yoon David G. Sibeck Daniel B. Graham |
| author_facet | Kyunghwan Dokgo Kyoung‐Joo Hwang James L. Burch Eunjin Choi Peter H. Yoon David G. Sibeck Daniel B. Graham |
| author_sort | Kyunghwan Dokgo |
| collection | DOAJ |
| description | Abstract MMS3 spacecraft passed the vicinity of the electron diffusion region of magnetotail reconnection on 3 July 2017, observing discrepancies between perpendicular electron bulk velocities and E→×B→ drift, and agyrotropic electron crescent distributions. Analyzing linear wave dispersions, Burch et al. (2019, https://doi.org/10.1029/2019GL082471) showed the electron crescent generates high‐frequency waves. We investigate harmonics of upper‐hybrid (UH) waves using both observation and particle‐in‐cell (PIC) simulation, and the generation of electromagnetic radiation from PIC simulation. Harmonics of UH are linearly polarized and propagate along the perpendicular direction to the ambient magnetic field. Compared with two‐dimensional PIC simulation and nonlinear kinetic theory, we show that the nonlinear beam‐plasma interaction between the agyrotropic electrons and the core electrons generates harmonics of UH. Moreover, PIC simulation shows that agyrotropic electron beam can lead to electromagnetic (EM) radiation at the plasma frequency and harmonics. |
| format | Article |
| id | doaj-art-3ce32840c3bd4ec4aef5eaa9f7031a09 |
| institution | OA Journals |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2019-07-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-3ce32840c3bd4ec4aef5eaa9f7031a092025-08-20T02:33:55ZengWileyGeophysical Research Letters0094-82761944-80072019-07-0146147873788210.1029/2019GL083361High‐Frequency Wave Generation in Magnetotail Reconnection: Nonlinear Harmonics of Upper Hybrid WavesKyunghwan Dokgo0Kyoung‐Joo Hwang1James L. Burch2Eunjin Choi3Peter H. Yoon4David G. Sibeck5Daniel B. Graham6Southwest Research Institute San Antonio TX USASouthwest Research Institute San Antonio TX USASouthwest Research Institute San Antonio TX USASouthwest Research Institute San Antonio TX USAInstitute for Physical Science and Technology University of Maryland College Park MD USANASA Goddard Space Flight Center Greenbelt MD USASwedish Institute of Space Physics Uppsala SwedenAbstract MMS3 spacecraft passed the vicinity of the electron diffusion region of magnetotail reconnection on 3 July 2017, observing discrepancies between perpendicular electron bulk velocities and E→×B→ drift, and agyrotropic electron crescent distributions. Analyzing linear wave dispersions, Burch et al. (2019, https://doi.org/10.1029/2019GL082471) showed the electron crescent generates high‐frequency waves. We investigate harmonics of upper‐hybrid (UH) waves using both observation and particle‐in‐cell (PIC) simulation, and the generation of electromagnetic radiation from PIC simulation. Harmonics of UH are linearly polarized and propagate along the perpendicular direction to the ambient magnetic field. Compared with two‐dimensional PIC simulation and nonlinear kinetic theory, we show that the nonlinear beam‐plasma interaction between the agyrotropic electrons and the core electrons generates harmonics of UH. Moreover, PIC simulation shows that agyrotropic electron beam can lead to electromagnetic (EM) radiation at the plasma frequency and harmonics.https://doi.org/10.1029/2019GL083361magnetic reconnectionnonlinear plasma wavesPIC simulation |
| spellingShingle | Kyunghwan Dokgo Kyoung‐Joo Hwang James L. Burch Eunjin Choi Peter H. Yoon David G. Sibeck Daniel B. Graham High‐Frequency Wave Generation in Magnetotail Reconnection: Nonlinear Harmonics of Upper Hybrid Waves Geophysical Research Letters magnetic reconnection nonlinear plasma waves PIC simulation |
| title | High‐Frequency Wave Generation in Magnetotail Reconnection: Nonlinear Harmonics of Upper Hybrid Waves |
| title_full | High‐Frequency Wave Generation in Magnetotail Reconnection: Nonlinear Harmonics of Upper Hybrid Waves |
| title_fullStr | High‐Frequency Wave Generation in Magnetotail Reconnection: Nonlinear Harmonics of Upper Hybrid Waves |
| title_full_unstemmed | High‐Frequency Wave Generation in Magnetotail Reconnection: Nonlinear Harmonics of Upper Hybrid Waves |
| title_short | High‐Frequency Wave Generation in Magnetotail Reconnection: Nonlinear Harmonics of Upper Hybrid Waves |
| title_sort | high frequency wave generation in magnetotail reconnection nonlinear harmonics of upper hybrid waves |
| topic | magnetic reconnection nonlinear plasma waves PIC simulation |
| url | https://doi.org/10.1029/2019GL083361 |
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