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High-Frequency Wave Generation in Magnetotail Reconnection: Nonlinear Harmonics of Upper Hybrid Waves
Southwest Res Inst, San Antonio, TX 78238 USA.
Southwest Res Inst, San Antonio, TX 78238 USA.
Southwest Res Inst, San Antonio, TX 78238 USA.
Southwest Res Inst, San Antonio, TX 78238 USA.
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2019 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 46, no 14, p. 7873-7882Article in journal (Refereed) Published
Abstract [en]

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) over right arrow x (B) over right arrow 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.

Place, publisher, year, edition, pages
AMER GEOPHYSICAL UNION , 2019. Vol. 46, no 14, p. 7873-7882
Keywords [en]
magnetic reconnection, nonlinear plasma waves, PIC simulation
National Category
Fusion, Plasma and Space Physics Geophysics
Identifiers
URN: urn:nbn:se:uu:diva-393833DOI: 10.1029/2019GL083361ISI: 000481818900002OAI: oai:DiVA.org:uu-393833DiVA, id: diva2:1355368
Available from: 2019-09-27 Created: 2019-09-27 Last updated: 2019-09-27Bibliographically approved

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Graham, Daniel B.
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Swedish Institute of Space Physics, Uppsala Division
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