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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| Format: | Article |
| Language: | English |
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Wiley
2022-06-01
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| Series: | Geophysical Research Letters |
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| 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. |
| format | Article |
| id | doaj-art-0c4f62edf50d4ceb9499c4274c26a2fb |
| institution | Kabale University |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2022-06-01 |
| publisher | Wiley |
| record_format | Article |
| 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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