High-Frequency Wave Generation in Magnetotail Reconnection : Nonlinear Harmonics of Upper Hybrid Waves
| العنوان: | High-Frequency Wave Generation in Magnetotail Reconnection : Nonlinear Harmonics of Upper Hybrid Waves |
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| المؤلفون: | Kyunghwan Dokgo, Daniel B. Graham, Kyoung-Joo Hwang, James L. Burch, David G. Sibeck, Peter H. Yoon, Eunjin Choi |
| المصدر: | Geophysical Research Letters |
| بيانات النشر: | Uppsala universitet, Institutet för rymdfysik, Uppsalaavdelningen, 2019. |
| سنة النشر: | 2019 |
| مصطلحات موضوعية: | 010504 meteorology & atmospheric sciences, Electron, Plasma oscillation, 7. Clean energy, 01 natural sciences, Electromagnetic radiation, Fusion, plasma och rymdfysik, Core electron, PIC simulation, 0103 physical sciences, Research Letter, Magnetospheric Physics, nonlinear plasma waves, Ionosphere, 010303 astronomy & astrophysics, Plasma Waves and Instabilities, 0105 earth and related environmental sciences, Physics, Solar Physics, Astrophysics, and Astronomy, Geofysik, Linear polarization, Magnetic reconnection, Fusion, Plasma and Space Physics, Research Letters, Magnetic field, Computational physics, Geophysics, Harmonics, magnetic reconnection, Physics::Space Physics, Space Plasma Physics, General Earth and Planetary Sciences, Magnetotail, Space Sciences |
| الوصف: | 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. Key Points Harmonics of upper‐hybrid waves are observed near an electron diffusion region of tail reconnectionNonlinear beam‐plasma interaction between the core and crescent electrons is responsible for harmonics generationParticle‐in‐cell simulation result suggests that radio emission is a result of the beam‐plasma interaction |
| وصف الملف: | application/pdf |
| اللغة: | English |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e589ac579dffec885ab1aa5c9e49ad6e http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-393833 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....e589ac579dffec885ab1aa5c9e49ad6e |
| قاعدة البيانات: | OpenAIRE |
| الوصف غير متاح. |