{"title":"地球弓形激波平顶电子分布的起源","authors":"Krzysztof Stasiewicz","doi":"10.1093/mnrasl/slad146","DOIUrl":null,"url":null,"abstract":"ABSTRACT An explanation is provided for flat-top electron distributions observed at the bow shock. It is shown that flat-tops are produced by the stochastic wave energization (SWE) mechanism. First, we demonstrate that flat-tops in one-dimensional (1D) reduced distribution functions correspond to rings in 2D distribution functions, or to shell distributions in 3D. The velocity of the ring/shell corresponds to the E × B velocity due to the wave electric field, $V_{\\mathrm{ E}{\\times }\\mathrm{ B}}=\\tilde{E}_\\perp /B$, which is a natural consequence of the SWE process. The identification of processes responsible for electron flat-top distributions was made with magnetospheric multiscale measurements supported by test-particle simulations.","PeriodicalId":18951,"journal":{"name":"Monthly Notices of the Royal Astronomical Society: Letters","volume":"4 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2023-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Origin of flat-top electron distributions at the Earth’s bow shock\",\"authors\":\"Krzysztof Stasiewicz\",\"doi\":\"10.1093/mnrasl/slad146\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"ABSTRACT An explanation is provided for flat-top electron distributions observed at the bow shock. It is shown that flat-tops are produced by the stochastic wave energization (SWE) mechanism. First, we demonstrate that flat-tops in one-dimensional (1D) reduced distribution functions correspond to rings in 2D distribution functions, or to shell distributions in 3D. The velocity of the ring/shell corresponds to the E × B velocity due to the wave electric field, $V_{\\\\mathrm{ E}{\\\\times }\\\\mathrm{ B}}=\\\\tilde{E}_\\\\perp /B$, which is a natural consequence of the SWE process. The identification of processes responsible for electron flat-top distributions was made with magnetospheric multiscale measurements supported by test-particle simulations.\",\"PeriodicalId\":18951,\"journal\":{\"name\":\"Monthly Notices of the Royal Astronomical Society: Letters\",\"volume\":\"4 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2023-10-04\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Monthly Notices of the Royal Astronomical Society: Letters\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1093/mnrasl/slad146\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"Earth and Planetary Sciences\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Monthly Notices of the Royal Astronomical Society: Letters","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1093/mnrasl/slad146","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"Earth and Planetary Sciences","Score":null,"Total":0}
Origin of flat-top electron distributions at the Earth’s bow shock
ABSTRACT An explanation is provided for flat-top electron distributions observed at the bow shock. It is shown that flat-tops are produced by the stochastic wave energization (SWE) mechanism. First, we demonstrate that flat-tops in one-dimensional (1D) reduced distribution functions correspond to rings in 2D distribution functions, or to shell distributions in 3D. The velocity of the ring/shell corresponds to the E × B velocity due to the wave electric field, $V_{\mathrm{ E}{\times }\mathrm{ B}}=\tilde{E}_\perp /B$, which is a natural consequence of the SWE process. The identification of processes responsible for electron flat-top distributions was made with magnetospheric multiscale measurements supported by test-particle simulations.
期刊介绍:
For papers that merit urgent publication, MNRAS Letters, the online section of Monthly Notices of the Royal Astronomical Society, publishes short, topical and significant research in all fields of astronomy. Letters should be self-contained and describe the results of an original study whose rapid publication might be expected to have a significant influence on the subsequent development of research in the associated subject area. The 5-page limit must be respected. Authors are required to state their reasons for seeking publication in the form of a Letter when submitting their manuscript.