Observational Evidence for the Origin of Repetitive Chorus Emissions
Abstract Chorus waves, discovered as a series of repetitive coherent emissions, are well known for producing hazard radiation environments in Earth's magnetosphere. Its repetitive nature directly causes the rapid modulation of pulsating aurora in the upper atmosphere and microburst in the ionos...
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| Main Authors: | , , , , , |
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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/10.1029/2022GL099000 |
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| _version_ | 1832591245961068544 |
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| author | Xinliang Gao Rui Chen Quanming Lu Lunjin Chen Huayue Chen Xueyi Wang |
| author_facet | Xinliang Gao Rui Chen Quanming Lu Lunjin Chen Huayue Chen Xueyi Wang |
| author_sort | Xinliang Gao |
| collection | DOAJ |
| description | Abstract Chorus waves, discovered as a series of repetitive coherent emissions, are well known for producing hazard radiation environments in Earth's magnetosphere. Its repetitive nature directly causes the rapid modulation of pulsating aurora in the upper atmosphere and microburst in the ionosphere, but its origin remains a decades‐old puzzle. Recent simulation suggested the energetic electrons, injected from the magnetotail and drifting eastward around the Earth, are critical to form the repetitive pattern. Based on a survey of 1.5 year data from Van Allen Probes, we provide the first observational evidence for the origin of repetitive chorus emissions. We find there exists universally an inverse correlation between the repetitive period and drift velocity of energetic electrons, uncovering how the drifting energetic electrons tune the repetitive period of chorus emissions, which is also supported by kinetic simulations. Our finding may apply to understand the generation of repetitive emissions in planetary magnetospheres and laboratory plasmas. |
| format | Article |
| id | doaj-art-946c1b5582804905a2cbca09c0e01de7 |
| 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-946c1b5582804905a2cbca09c0e01de72025-01-22T14:38:16ZengWileyGeophysical Research Letters0094-82761944-80072022-06-014912n/an/a10.1029/2022GL099000Observational Evidence for the Origin of Repetitive Chorus EmissionsXinliang Gao0Rui Chen1Quanming Lu2Lunjin Chen3Huayue Chen4Xueyi Wang5CAS Key Laboratory of Geospace Environment Department of Geophysics and Planetary Science University of Science and Technology of China Hefei ChinaCAS Key Laboratory of Geospace Environment Department of Geophysics and Planetary Science University of Science and Technology of China Hefei ChinaCAS Key Laboratory of Geospace Environment Department of Geophysics and Planetary Science University of Science and Technology of China Hefei ChinaDepartment of Physics University of Texas at Dallas Richardson TX USACAS Key Laboratory of Geospace Environment Department of Geophysics and Planetary Science University of Science and Technology of China Hefei ChinaPhysics Department Auburn University Auburn AL USAAbstract Chorus waves, discovered as a series of repetitive coherent emissions, are well known for producing hazard radiation environments in Earth's magnetosphere. Its repetitive nature directly causes the rapid modulation of pulsating aurora in the upper atmosphere and microburst in the ionosphere, but its origin remains a decades‐old puzzle. Recent simulation suggested the energetic electrons, injected from the magnetotail and drifting eastward around the Earth, are critical to form the repetitive pattern. Based on a survey of 1.5 year data from Van Allen Probes, we provide the first observational evidence for the origin of repetitive chorus emissions. We find there exists universally an inverse correlation between the repetitive period and drift velocity of energetic electrons, uncovering how the drifting energetic electrons tune the repetitive period of chorus emissions, which is also supported by kinetic simulations. Our finding may apply to understand the generation of repetitive emissions in planetary magnetospheres and laboratory plasmas.https://doi.org/10.1029/2022GL099000chorus waverepetitive perioddrift velocityVan Allen ProbesgcPIC‐δf simulation |
| spellingShingle | Xinliang Gao Rui Chen Quanming Lu Lunjin Chen Huayue Chen Xueyi Wang Observational Evidence for the Origin of Repetitive Chorus Emissions Geophysical Research Letters chorus wave repetitive period drift velocity Van Allen Probes gcPIC‐δf simulation |
| title | Observational Evidence for the Origin of Repetitive Chorus Emissions |
| title_full | Observational Evidence for the Origin of Repetitive Chorus Emissions |
| title_fullStr | Observational Evidence for the Origin of Repetitive Chorus Emissions |
| title_full_unstemmed | Observational Evidence for the Origin of Repetitive Chorus Emissions |
| title_short | Observational Evidence for the Origin of Repetitive Chorus Emissions |
| title_sort | observational evidence for the origin of repetitive chorus emissions |
| topic | chorus wave repetitive period drift velocity Van Allen Probes gcPIC‐δf simulation |
| url | https://doi.org/10.1029/2022GL099000 |
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