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Frequency Bands and Gaps of Magnetospheric Chorus Waves Generated by Resonant Beam/Plateau Electrons

Journal of Modern Physics 2022年第6期13卷 864-891页

作者： Konrad Sauer Huayue Chen Eduard Dubinin quanming lu CAS Key Laboratory of Geoscience Environment School of Earth and Space Sciences University of Science and Technology of China Hefei China CAS Center of Excellence in Comparative Planetology Hefei China Max-Plnack Institute for Solar System Research G&ouml ttingen Germany

In this paper, the modifications of the whistler dispersion characteristics are investigated which arise if resonant electrons are taken into account. The following chain of processes is emphasized: Generation of whistler waves propagating at different angles to the magnetic field and their nonlinear interaction with resonant electrons result in the appearance of modulated electron beams in the background plasma. As a result, the dispersion characteristics of waves in this new plasma might be significantly changed. By analysing the modified dispersion characteristics these changes are discussed. Supported by particle simulations and space observations, it is assumed that in the electron distribution function at the resonance velocity a plateau-like beam is formed. Because of the weakness of the beam, the term “beam/plateau population (b/p)” is used. By solving the kinetic dispersion relation of whistler waves in electron plasmas with b/p populations, the associated modifications of the whistler dispersion characteristics are presented in diagrams showing, in particular, the frequency versus propagation angle dependence of the excited waves. It is important to point out the two functions of the b/p populations. Because of the bi-directional excitation of whistler waves by temperature anisotropy, one has to distinguish between up- and downstream populations and accordingly between two b/p modes. The interaction of the beam-shifted cyclotron mode ω= Ωe + k⋅Vb (V bVb is the b/p velocity, Ωe: electron cyclotron frequency) with the whistler mode leads to enhanced damping at the ω-k point where they intersect. This is the origin of the frequency gap at half the electron cyclotron frequency (ω~Ωe/2) for quasi-parallel waves which are driven by temperature anisotropy. Furthermore, it is shown that the upstream b/p electrons alone (in the absence of temperature anisotropy) can

关键词： Radiation Belts Waves Whistlers Chorus

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“祝融号”探测火星表面磁场

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科学通报 2023年第27期68卷 3562-3564页

作者：陆全明中国科学技术大学地球和空间科学学院合肥230026

火星全球性磁场的消失致使火星大气缺少了一道保护屏障,大气和水更容易被太阳风携带到行星际空间中,影响了火星早期生命的宜居环境.火星岩石剩磁记录着火星磁场的历史信息,是揭示早期火星液核发电机的状态、火星内部热历史和动力学过程... 详细信息

火星全球性磁场的消失致使火星大气缺少了一道保护屏障,大气和水更容易被太阳风携带到行星际空间中,影响了火星早期生命的宜居环境.火星岩石剩磁记录着火星磁场的历史信息,是揭示早期火星液核发电机的状态、火星内部热历史和动力学过程等火星内部物理的窗口[1].

关键词：祝融行星际空间保护屏障火星表面火星大气宜居环境太阳风动力学过程

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Electron surfing acceleration in a current sheet of flares

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Science China(Physics,Mechanics & Astronomy) 2009年第11期52卷 1810-1812页

作者： WANG DeYu1 & lu quanming2 1 Purple Mountain Observatory, Nanjing 210008, China 2 School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China Purple Mountain Observatory Nanjing 210008 China School of Earth and Space Sciences University of Science and Technology of China Hefei 230026 China

A model of electron acceleration in a current sheet of flares is studied by the analytical approximation solution and the test particle simulation. The electron can be trapped in a potential of propagating electrostatic wave. The trapped electron moving with the phase velocity v p of wave may be effectively accelerated by ev p/c × B z force along the outflow direction in the current sheet, if a criterion condition K > 0 for electron surfing acceleration is satisfied. The electron will be accelerated continuously until the electron de-trap from the wave potential at the turning point S.

关键词： electron acceleration electrostatic wave current sheet

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Multiband chorus waves in Earth's magnetosphere

Multiband chorus waves in Earth's magnetosphere

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2019年中国地球科学联合学术年会

作者： Xinliang Gao quanming lu Shui Wang University of Science and Technology of China

In this talk, I will present our latest work about multiband chorus waves in Earth's magnetosphere. We reported the multiband chorus waves with THEMIS waveform data for the first time. In the multiband chorus event, t... 详细信息

关键词： Earth Multiband chorus waves in Earth's magnetosphere

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Energy Budgets of the Dipolarization Front in Magnetic Reconnection through Kinetic Simulations

Energy Budgets of the Dipolarization Front in Magnetic Recon...

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2023年中国地球科学联合学术年会

作者： Shu Yukang lu San lu quanming Ding Weixing University of Science and Technology of China

Magnetic reconnection is a fundamental energy converting process in space plasma and astronomy. During the process, magnetic energy is released and particles are accelerated. Former studies[1,2] have shown that energy conversion is not limited near the reconnection site;the dipolarization front (DF) takes a large proportion of energy conversion. It becomes intriguing how magnetic energy is converted to ions and electrons at the DF.

关键词： Energy Budgets of the Dipolarization Front in Magnetic Reconnection through Kinetic Simulations

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Parametric instability of a linearly polarized monochromaticAlfven wave:Perpendicular decay in low beta plasma

Parametric instability of a linearly polarized monochromatic...

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中国空间科学学会空间物理学专业委员会第十五届全国日地空间物理学研讨会

作者： XinliangGao quanming lu Lican Shan Shui Wang CAS Key Laboratory of Geospace Environment Department of Geophysics and Planetary ScienceUniversity of Science and Technology of China

Two-dimensional hybrid simulations are performed to investigate the parametric decay of a monochromatic Alfven wave with a linear polarization in low beta *** find that the parametric decay is actually a two-dimentional ***,the parametric decay takes place along the propagating direction of the pump wave,and then the decay occurs in the perpendicular *** the increase of the amplitude of the pump wave,both the linear growth rate and the saturated amplitude of the parametric decay increase,and the spectral range of the excited waves becomes broad in the perpendicular *** the linear growth rate of the parametric decay decreases with the increase of the plasma beta,the effects of the plasma beta on the saturated amplitude and the spectral range of the excited waves in the perpendicular direction are *** parametric decay of an obliquely propagating pump wave is also studied in this ***,the decay initially takes place along the propagating direction of the pump wave,and then it occurs in the perpendicular *** spectral range of the excited waves broadens in the perpendicular direction with the increase of the propagating angle of the pump wave(the angle between the propagating direction of the pump wave and the ambient magnetic field).

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Observation of non-gyrotropic electron distribution across electron diffusion region of reconnection in the magnetotail

Observation of non-gyrotropic electron distribution across e...

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2019年中国地球科学联合学术年会

作者： Xinmin Li Rongsheng Wang quanming lu Shui Wang University of Science and Technology of China

By measurements of Magnetospheric Multiscale(MMS) spacecraft in the magnetotail, we study electron distribution functions across an electron diffusion region with a halfwidth of ～8 electron inertial lengths. The dependence of the electron non-gyrotropical distribution function on the electron energy and vertical distance from the EDR middle

关键词： Observation of non-gyrotropic electron distribution across electron diffusion region of reconnection in the magnetotail

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Out-of-plane currents in magnetic islands formed during collisionless magnetic reconnection

Out-of-plane currents in magnetic islands formed during coll...

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中国空间科学学会空间物理学专业委员会第十五届全国日地空间物理学研讨会

作者： HUANG Can lu quanming WU Mingyu lu San WANG Shui CAS Key Laboratory of Geospace Environment Department of Geophysics and Planetary SciencesUniversity of Science and Technology of China

Secondary islands are considered to play a crucial role in collisionless magnetic *** on 2-D particle-in-cell simulations,we investigate the characteristics of the out-of-plane electron currents in magnetic islands formed during collisionless magnetic reconnection with an initial guide *** a primary island(formed simultaneously with the appearance of the X lines),due to the acceleration of the trapped electrons,the direction of the formed out-of-plane electron current is reverse to the original *** the secondary island(formed in the vicinity of the X-line),the out-of-plane electron current is generated due to the accelerated electrons by the reconnection electric field in the vicinity of the X *** such a way,the direction of the out-of-plane electron current in a secondary island is found to be opposite to that in a primary *** characteristics are found to be related to the evolution of the magnetic islands and then electron dynamics in the islands,which are proposed in this paper to be a possible criterion to identify a secondary island formed during collisionless magnetic reconnection,especially in the magnetotail.

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Statistical analysis of relativistic electron precipitation in the magnetosphere from POES observations

Statistical analysis of relativistic electron precipitation ...

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2019年中国地球科学联合学术年会

作者： Huayue Chen Xinliang Gao quanming lu N.A.Tsyganenko Yongcun Zhang University of Science and Technology of China Saint Petersburg State University Department of Earth's Physics Saint Petersburg State University State Key Laboratory of Space Weather National Space Science Center

In this letter, we investigate the characters of relativistic electron precipitation(REP), which is derived from seven NOAA Polar-orbiting Operational Environmental Satellites(POES) in the time period from Jan 2012 to... 详细信息

关键词： Statistical analysis of relativistic electron precipitation in the magnetosphere from POES observations REP

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Repetitive emissions of rising-tone chorus waves in the inner magnetosphere

Repetitive emissions of rising-tone chorus waves in the inne...

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作者： quanming lu lunjin Chen Xueyi Wang Xinliang Gao Yu Lin Shui Wang

Chorus waves are electromagnetic emissions that are commonly observed in the Earth's inner magnetospheres,and they typically occur in the form of discrete and repetitive quasi-monochromatic emissions with a rising frequency *** rising frequency chirping of chorus waves are considered to be related with electromagnetic electron hole in the wave phase space formed after resonant electrons have been trapped by whistler-mode waves.

关键词： Repetitive emissions of rising-tone chorus waves in the inner magnetosphere

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