Amplitude Dependence of Nonlinear Precipitation Blocking of Relativistic Electrons by Large Amplitude EMIC Waves

Abstract Recent work has shown that ElectroMagnetic Ion Cyclotron (EMIC) waves tend to occur in four distinct regions, each having their own characteristics and morphology. Here, we use nonlinear test‐particle simulations to examine the range of energetic electron scattering responses to two EMIC wa...

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Main Authors: Jacob Bortnik, Jay M. Albert, Anton Artemyev, Wen Li, Chae‐Woo Jun, Veronika S. Grach, Andrei G. Demekhov
Format: Article
Language:English
Published: Wiley 2022-06-01
Series:Geophysical Research Letters
Subjects:
Online Access:https://doi.org/10.1029/2022GL098365
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author Jacob Bortnik
Jay M. Albert
Anton Artemyev
Wen Li
Chae‐Woo Jun
Veronika S. Grach
Andrei G. Demekhov
author_facet Jacob Bortnik
Jay M. Albert
Anton Artemyev
Wen Li
Chae‐Woo Jun
Veronika S. Grach
Andrei G. Demekhov
author_sort Jacob Bortnik
collection DOAJ
description Abstract Recent work has shown that ElectroMagnetic Ion Cyclotron (EMIC) waves tend to occur in four distinct regions, each having their own characteristics and morphology. Here, we use nonlinear test‐particle simulations to examine the range of energetic electron scattering responses to two EMIC wave groups that occur at low L‐shells and overlap the outer radiation belt electrons. The first group consists of low‐density, H‐band region b waves, and the second group consists of high‐density, He‐band region c waves. Results show that while low‐density EMIC waves cannot precipitate electrons below ∼16 MeV, the high density EMIC waves drive a range of linear and nonlinear behaviors including phase bunching and trapping. In particular, a nonlinear force bunching effect can rapidly advect electrons at low pitch‐angles near the minimum resonant energy to larger pitch angles, effectively blocking precipitation and loss. This effect contradicts conventional expectations and may have profound implication for observational campaigns.
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institution Kabale University
issn 0094-8276
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publishDate 2022-06-01
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series Geophysical Research Letters
spelling doaj-art-0c4f62edf50d4ceb9499c4274c26a2fb2025-01-22T14:38:16ZengWileyGeophysical Research Letters0094-82761944-80072022-06-014912n/an/a10.1029/2022GL098365Amplitude Dependence of Nonlinear Precipitation Blocking of Relativistic Electrons by Large Amplitude EMIC WavesJacob Bortnik0Jay M. Albert1Anton Artemyev2Wen Li3Chae‐Woo Jun4Veronika S. Grach5Andrei G. Demekhov6Department of Atmospheric and Oceanic Sciences University of California at Los Angeles Los Angeles CA USAUnited States Air Force Research Laboratory Albuquerque NM USADepartment of Earth, Planetary, and Space Sciences University of California at Los Angeles Los Angeles CA USACenter for Space Physics Boston University Boston MA USASolar‐Terrestrial Environment Laboratory Nagoya‐Shi JapanInstitute of Applied Physics Russian Academy of Sciences Nizhny Novgorod RussiaInstitute of Applied Physics Russian Academy of Sciences Nizhny Novgorod RussiaAbstract Recent work has shown that ElectroMagnetic Ion Cyclotron (EMIC) waves tend to occur in four distinct regions, each having their own characteristics and morphology. Here, we use nonlinear test‐particle simulations to examine the range of energetic electron scattering responses to two EMIC wave groups that occur at low L‐shells and overlap the outer radiation belt electrons. The first group consists of low‐density, H‐band region b waves, and the second group consists of high‐density, He‐band region c waves. Results show that while low‐density EMIC waves cannot precipitate electrons below ∼16 MeV, the high density EMIC waves drive a range of linear and nonlinear behaviors including phase bunching and trapping. In particular, a nonlinear force bunching effect can rapidly advect electrons at low pitch‐angles near the minimum resonant energy to larger pitch angles, effectively blocking precipitation and loss. This effect contradicts conventional expectations and may have profound implication for observational campaigns.https://doi.org/10.1029/2022GL098365EMICnonlinearwave‐particle interactionsradiation beltsprecipitation blockingforce bunching
spellingShingle Jacob Bortnik
Jay M. Albert
Anton Artemyev
Wen Li
Chae‐Woo Jun
Veronika S. Grach
Andrei G. Demekhov
Amplitude Dependence of Nonlinear Precipitation Blocking of Relativistic Electrons by Large Amplitude EMIC Waves
Geophysical Research Letters
EMIC
nonlinear
wave‐particle interactions
radiation belts
precipitation blocking
force bunching
title Amplitude Dependence of Nonlinear Precipitation Blocking of Relativistic Electrons by Large Amplitude EMIC Waves
title_full Amplitude Dependence of Nonlinear Precipitation Blocking of Relativistic Electrons by Large Amplitude EMIC Waves
title_fullStr Amplitude Dependence of Nonlinear Precipitation Blocking of Relativistic Electrons by Large Amplitude EMIC Waves
title_full_unstemmed Amplitude Dependence of Nonlinear Precipitation Blocking of Relativistic Electrons by Large Amplitude EMIC Waves
title_short Amplitude Dependence of Nonlinear Precipitation Blocking of Relativistic Electrons by Large Amplitude EMIC Waves
title_sort amplitude dependence of nonlinear precipitation blocking of relativistic electrons by large amplitude emic waves
topic EMIC
nonlinear
wave‐particle interactions
radiation belts
precipitation blocking
force bunching
url https://doi.org/10.1029/2022GL098365
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