Observations of Particle Loss due to Injection‐Associated Electromagnetic Ion Cyclotron Waves

Kim, Hyomin; Schiller, Q.; Engebretson, M. J.; Noh, S. J.; Kuzichev, Ilya; Lanzerotti, L. J.; Gerrard, A. J.; Kim, Khan‐Hyuk; Lessard, M.; Lee, Dong Hoon; Matzka, Jürgen; Fromm, Tanja

doi:10.1029/2020ja028503

Cited by 16 publications

(17 citation statements)

References 110 publications

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“…Shprits et al. ( 2017 ) noted that local deepening minima occurring in PSD profiles can also be indicative of fast localized loss processes, such as those resulting from resonant interactions with electromagnetic ion cyclotron (EMIC) waves studied here (e.g., Aseev et al., 2017 ; Blum et al., 2020 ; Capannolo, Li, Ma, Chen, et al., 2019 ; Kim et al., 2021 ; Ma et al., 2020 ; Xiang et al., 2017 ).…”

Section: Introductionmentioning

confidence: 88%

Depletions of Multi‐MeV Electrons and Their Association to Minima in Phase Space Density

Drozdov

Allison

Shprits

et al. 2022

Geophysical Research Letters

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Earth's outer radiation belt is a region of geomagnetically confined electrons and can contain particles with multi-MeV energies. Changes in the flux of the multi-MeV populations may be reversible (i.e., adiabatic) or irreversible and can arise from a number of processes, including large-scale magnetic field fluctuations and wave-particle interactions. Analysis of phase space density (PSD) profiles (e.g.,

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Section: Introductionmentioning

confidence: 88%

Depletions of Multi‐MeV Electrons and Their Association to Minima in Phase Space Density

Drozdov

Allison

Shprits

et al. 2022

Geophysical Research Letters

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“…Among them is an event observed on 27 February 2019, which has been previously reported in Kim et al. (2021), although the authors focused only on the EMIC waves without noticing their associations with the magnetic dip structure.…”

Section: Sample Observationsmentioning

confidence: 93%

Localized Excitation of Electromagnetic Ion Cyclotron Waves From Anisotropic Protons Filtered by Magnetic Dips

Yin

Zhou

et al. 2022

JGR Space Physics

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The excitation of electrostatic and/or electromagnetic waves in the plasma universe is often associated with anisotropic velocity distributions of charged particles. In Earth's inner magnetosphere, this anisotropy can gradually develop as particles injected from the magnetotail drift around the Earth at different speeds depending on their energy and pitch angle. Here, we show that the perpendicular‐moving and bouncing ions can be separated more abruptly near the injection front. These pitch‐angle filters are localized magnetic dip structures formed by the diamagnetic behavior of the injected particles, which can trap perpendicular‐moving ions and allow bouncing ions to overtake. The resulting ion anisotropy facilitates the rapid generation of electromagnetic ion cyclotron (EMIC) waves, which in turn can largely reshape the Van Allen radiation belts. This scenario is examined by case and statistical observations, together with numerical simulations that reproduce most of the observational signatures, to support the causal relationship between magnetic dips, anisotropic ion distributions, and localized excitation of EMIC waves. Our study highlights the important roles of magnetic dips in the inner magnetospheric dynamics, as pitch‐angle filters of the injected ions and traveling hotspots of EMIC wave activities.

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“…Observational evidence of relativistic electron precipitation in association with EMIC waves has been reported by an increasing number of recent studies (e.g. Rodger et al, 2008;Li et al, 2014;Blum et al, 2015;Blum et al, 2019;Lessard et al, 2019;Qin et al, 2019;Sigsbee et al, 2020;Kim et al, 2021). However, the cold plasma approximation may fail near the He + gyrofrequency, and the warm plasma effect of He + ions on wave growth should be considered.…”

Section: Wave Effectsmentioning

confidence: 98%

On the Impacts of Ions of Ionospheric Origin and Their Composition on Magnetospheric EMIC Waves

Lee

Blum

Chen

2021

Front. Astron. Space Sci.

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Large numbers of theory and observation studies have been conducted on electromagnetic ion cyclotron (EMIC) waves occurring in Earth’s magnetosphere. Numerous studies have shown that accurately specifying the ions of ionospheric origin and their composition can greatly improve understanding of magnetospheric EMIC waves, specifically their generation, their properties, and their effects on the magnetospheric plasma populations. With the launch and operations of multiple recent missions carrying plasma instrumentation capable of acquiring direct measurements of multiple ion species, we use this opportunity to review recent magnetospheric EMIC wave efforts utilizing these new assets, with particular focus on the role of ions of ionospheric origin in wave generation, propagation, and interaction with particles. The review of progress leads us to a discussion of the unresolved questions to be investigated using future modeling capabilities or when new missions or instrumentation capabilities are developed.

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Observations of Particle Loss due to Injection‐Associated Electromagnetic Ion Cyclotron Waves

Cited by 16 publications

References 110 publications

Depletions of Multi‐MeV Electrons and Their Association to Minima in Phase Space Density

Depletions of Multi‐MeV Electrons and Their Association to Minima in Phase Space Density

Localized Excitation of Electromagnetic Ion Cyclotron Waves From Anisotropic Protons Filtered by Magnetic Dips

On the Impacts of Ions of Ionospheric Origin and Their Composition on Magnetospheric EMIC Waves

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