Statistical Properties of Hiss in Plasmaspheric Plumes and Associated Scattering Losses of Radiation Belt Electrons

Zhang, Wenxun; Ni, Binbin; Huang, He; Summers, Danny; Fu, Song; Xiang, Zheng; Gu, Xudong; Cao, Xing; Lou, Yunjiang; Hua, Man

doi:10.1029/2018gl081863

Cited by 38 publications

(48 citation statements)

References 54 publications

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“…Approximately 40 min later, Van Allen Probe B encountered the substorm injection of electrons with energies up to 100 keV and received the strong whistler mode hiss waves with amplitudes up to 0.3 nT in the plasmaspheric plumes. These plume hiss waves propagated mainly in the anti‐field‐aligned direction away from the equator, consistent with previous observations (Shi et al, 2019; Su et al, 2018a; Woodroffe et al, 2017; Zhang et al, 2019). As discussed by Su et al (2018a), these waves could be a result of the combined linear and nonlinear instabilities of the freshly injected ring current electrons (Omura et al, 2015; Summers et al, 2014; Thorne et al, 1979).…”

Section: Van Allen Probes Observationssupporting

confidence: 91%

Suprathermal Electron Evolution Under the Competition Between Plasmaspheric Plume Hiss Wave Heating and Collisional Cooling

Wang

Liu

et al. 2020

Geophysical Research Letters

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Suprathermal electrons are a major heat source of ionospheric plasma. How the suprathermal electrons evolve during their bounces inside the plasmasphere is a fundamental question for the magnetosphere-ionosphere coupling. On the basis of Van Allen Probes observations and quasi-linear simulations, we present here the first quantitative study on the evolution of suprathermal electrons under the competition between Landau heating by whistler mode hiss waves and Coulomb collisional cooling by background plasma inside a plasmaspheric plume. We show that the Landau heating can prevail over the collisional cooling for >50 eV electrons and cause the field-aligned suprathermal electron fluxes to increase by up to 1 order of magnitude within 1.5 hr. Our results imply that the plasmaspheric plume hiss waves could mediate energy from the ring current electrons to the ionospheric plasma. Plain Language Summary The ionospheric plasma temperature variation can affect the Earth's atmospheric escape and the spacecraft orbit decay. A major heat source of the ionospheric plasma is the suprathermal (several eV to hundreds of eV) electrons, which can bounce along the magnetic field lines inside the plasmasphere. How these suprathermal electrons evolve during their bounces is a fundamental question for the magnetosphere-ionosphere coupling. In the past, the plasmaspheric suprathermal electrons were usually considered to gain energy from the ring current ions through Coulomb collisions and wave-particle interactions. Here we show that strong whistler mode hiss waves can grow from the instability of the ring current electrons in the plasmaspheric drainage plume, and their Landau heating can prevail over the collisional cooling by background plasma for >50 eV electrons. The enhanced field-aligned suprathermal electrons could eventually heat the ionospheric plasma. These results have significant implications for understanding the energy transfer process from the magnetosphere to the ionosphere.

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Section: Van Allen Probes Observationssupporting

confidence: 91%

Suprathermal Electron Evolution Under the Competition Between Plasmaspheric Plume Hiss Wave Heating and Collisional Cooling

Wang

Liu

et al. 2020

Geophysical Research Letters

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“…A better understanding of the nonlinear mechanism of generation and growth of hiss waves may help to reveal their origin and to better understand their internal structure (e.g., Omura, Nakamura, et al, ; Nakamura et al, ). Whistler mode hiss waves are also observed in high‐density plumes outside the plasmasphere (Chan & Holzer, ; Summers et al, ) and the characterization of their properties and their effect outside the plasmasphere is ongoing (Woodroffe et al, ; Su et al, ; Shi et al, ; Li et al 2019; Zhang et al, ; Zhang, Ni, et al, ).…”

Section: Particle Loss In the Inner And Outer Zonesmentioning

confidence: 99%

Particle Dynamics in the Earth's Radiation Belts: Review of Current Research and Open Questions

et al. 2020

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The past decade transformed our observational understanding of energetic particle processes in near‐Earth space. An unprecedented suite of observational systems was in operation including the Van Allen Probes, Arase, Magnetospheric Multiscale, Time History of Events and Macroscale Interactions during Substorms, Cluster, GPS, GOES, and Los Alamos National Laboratory‐GEO magnetospheric missions. They were supported by conjugate low‐altitude measurements on spacecraft, balloons, and ground‐based arrays. Together, these significantly improved our ability to determine and quantify the mechanisms that control the buildup and subsequent variability of energetic particle intensities in the inner magnetosphere. The high‐quality data from National Aeronautics and Space Administration's Van Allen Probes are the most comprehensive in situ measurements ever taken in the near‐Earth space radiation environment. These observations, coupled with recent advances in radiation belt theory and modeling, including dramatic increases in computational power, have ushered in a new era, perhaps a “golden era,” in radiation belt research. We have edited a Journal of Geophysical Research: Space Science Special Collection dedicated to Particle Dynamics in the Earth's Radiation Belts in which we gather the most recent scientific findings and understanding of this important region of geospace. This collection includes the results presented at the American Geophysical Union Chapman International Conference in Cascais, Portugal (March 2018) and many other recent and relevant contributions. The present article introduces and review the context, current research, and main questions that motivate modern radiation belt research divided into the following topics: (1) particle acceleration and transport, (2) particle loss, (3) the role of nonlinear processes, (4) new radiation belt modeling capabilities and the quantification of model uncertainties, and (5) laboratory plasma experiments.

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“…interactions inside and outside the plasmapause are quite different due to the sharp change in plasma density, the prediction of the plasmapause location becomes very important for magnetospheric research (e.g., Hua et al, 2020b;Khoo et al, 2018Khoo et al, , 2019Ni et al, 2015;Ma et al, 2020;Summers et al, 2008;Xiang et al, 2020;Zhang et al, 2018Zhang et al, , 2019.…”

Section: Accepted Articlementioning

confidence: 99%

Prediction of Dynamic Plasmapause Location Using a Neural Network

Guo

Xiang

et al. 2021

Space Weather

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Statistical Properties of Hiss in Plasmaspheric Plumes and Associated Scattering Losses of Radiation Belt Electrons

Cited by 38 publications

References 54 publications

Suprathermal Electron Evolution Under the Competition Between Plasmaspheric Plume Hiss Wave Heating and Collisional Cooling

Suprathermal Electron Evolution Under the Competition Between Plasmaspheric Plume Hiss Wave Heating and Collisional Cooling

Particle Dynamics in the Earth's Radiation Belts: Review of Current Research and Open Questions

Prediction of Dynamic Plasmapause Location Using a Neural Network

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