Bursty emission of whistler waves in association with plasmoid collision

Fujimoto, Keizo

doi:10.5194/angeo-35-885-2017

Cited by 5 publications

(3 citation statements)

References 32 publications

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“…It is believed that FRs play an important role in the macroscopic and microscopic physical processes occurring during magnetic reconnection, such as modulation of reconnection rates and electron accelerations (e.g., Chen et al, ; Daughton et al, , ; Drake et al, ; Fu, Cao, et al, ; Fu, Khotyaintsev, et al, ; Fujimoto, ). Simulations have shown that the electrons can be accelerated by the contracting of FRs via the Fermi acceleration mechanism (Drake et al, ; Fu et al, ), by the reconnection electric field in the secondary FRs (Oka, Fujimoto, et al, ), and by the coalescence of FRs (Oka, Phan, et al, ; Pritchett, ; Zhou et al, ) in the reconnection region.…”

Section: Introductionmentioning

confidence: 99%

Observations of Flux Ropes With Strong Energy Dissipation in the Magnetotail

Huang

Jiang

Yuan

et al. 2019

Geophysical Research Letters

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An ion‐scale flux rope (FR), embedded in a high‐speed electron flow (possibly an electron vortex), is investigated in the magnetotail using observations from the Magnetospheric Multiscale (MMS) spacecraft. Intense electric field and current and abundant waves are observed in the exterior and interior regions of the FR. Comparable parallel and perpendicular currents in the interior region imply that the FR has a non‐force‐free configuration. Electron demagnetization occurs in some subregions of the FR. It is surprising that strong dissipation (J × E' up to 2,000 pW/m3) occurs in the center of the FR without signatures of secondary reconnection or coalescence of two FRs, implying that FR may provide another important channel for energy dissipation in space plasmas. These features indicate that the observed FR is still highly dynamical, and hosts multiscale coupling processes, even though the FR has a very large scale and is far away from the reconnection site.

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Section: Introductionmentioning

confidence: 99%

Observations of Flux Ropes With Strong Energy Dissipation in the Magnetotail

Huang

Jiang

Yuan

et al. 2019

Geophysical Research Letters

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“…This confirms the case study by Khotyaintsev et al (2011), where the location of the whistler source at the center of the current sheet has been determined from multispacecraft observations of the wave Poynting flux. However, in more complex reconnection configurations, as in the case of plasmoid coalescence (secondary reconnection), the source of pile-up driven whistlers can be located away from the center of the main current sheet (Fujimoto, 2017).…”

Section: Whistlersmentioning

confidence: 99%

Collisionless Magnetic Reconnection and Waves: Progress Review

Khotyaintsev

Graham

Norgren

et al. 2019

Front. Astron. Space Sci.

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“…Multipoint spacecraft observations showed that the magnetic structures associated with the earthward and tailward bulk flows can be formed at ion and sub-ion kinetic scales and/or have very thin fronts/boundaries with a characteristic thickness of the order of ion gyroradius or less (Sergeev et al 2009;Balikhin et al 2014;Huang et al 2016;Grigorenko et al 2018;He et al 2021). These structures can be the sites of strong energy dissipation (e.g., Drake et al 2006;Fu et al 2006;Oka et al 2010;Huang et al 2019), which affects the particle velocity distribution functions and causes the generation of various types of electromagnetic and electrostatic wave modes (e.g., Zhang et al 1999;Le Contel et al 2009;Tenerani et al 2013;Fujimoto 2014Fujimoto , 2017Zhang & Angelopoulos 2014;Grigorenko et al 2016;Huang et al 2016;Wang et al 2016;Guo et al 2021;Pickett 2021).…”

Section: Introductionmentioning

confidence: 99%

Quasi-parallel Whistler Waves and Their Interaction with Resonant Electrons during High-velocity Bulk Flows in the Earth’s Magnetotail

Григоренко

Malykhin

Kronberg

et al. 2023

ApJ

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In collisionless space, plasma waves are important channels of energy conversion, affecting the local particle velocity distribution functions through wave–particle interactions. In this paper we present a comparative statistical analysis of the characteristics of quasi-parallel narrowband whistler waves and the properties of resonant electrons interacting with these waves during the intervals of earthward and tailward high-velocity bulk flows produced by the near-Earth X-line and observed by Magnetospheric Multiscale Mission spacecraft. We found that on both sides of the X-line, the suprathermal electrons (≥1 keV) having large pitch angles make the major contribution to the maximal growth rate (γ) of these waves. The whistler waves were observed almost simultaneously with strong enhancements of perpendicular magnetic gradients localized at electron scales near dipolarization fronts associated with the earthward bulk flows, and near flux ropes/magnetic islands embedded into the tailward bulk flows. Betatron energization of electrons due to the appearance of such gradients increases the perpendicular anisotropy of electron distribution, which could be responsible for the whistler wave generation. We found that in the course of electron interactions with the whistler waves the lower-energy resonant electrons can transfer a part of their kinetic energy to the higher-energy electrons, especially in the Central Plasma Sheet. This results in formation/enhancement of energy-dependent perpendicular anisotropy and power-law tails in the high-energy range of electron velocity distribution. We conclude that despite the differences in the magnetic structure of the earthward and tailward bulk flows, the mechanisms of the quasi-parallel whistler wave generation and the properties of resonant electrons are quite similar.

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Bursty emission of whistler waves in association with plasmoid collision

Cited by 5 publications

References 32 publications

Observations of Flux Ropes With Strong Energy Dissipation in the Magnetotail

Observations of Flux Ropes With Strong Energy Dissipation in the Magnetotail

Collisionless Magnetic Reconnection and Waves: Progress Review

Quasi-parallel Whistler Waves and Their Interaction with Resonant Electrons during High-velocity Bulk Flows in the Earth’s Magnetotail

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