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DOI | 10.1029/2020GL086958 |
Frequency Dependence of Very Low Frequency Chorus Poynting Flux in the Source Region: THEMIS Observations and a Model | |
Demekhov, A. G.1,2; Taubenschuss, U.3; Hanzelka, M.3,4; Santolik, O.3,4 | |
2020-03-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2020 |
卷号 | 47期号:6 |
文章类型 | Article |
语种 | 英语 |
国家 | Russia; Czech Republic |
英文摘要 | Using Poynting vector measurements of whistler mode chorus emissions detected by the THEMIS spacecraft within the source region, that is, close to the magnetic field minimum, we found both in individual events and statistically that chorus elements propagating equatorward had systematically higher frequencies and smaller amplitudes compared with simultaneously observed elements propagating away from the equator. We demonstrate similar features in the results of numerical simulations based on backward wave oscillator equations. It can be qualitatively explained by the nonlinear evolution of the energetic electron distribution function during wave generation. The motion of electrons from the equator is accompanied by a decrease in their velocity component along the magnetic field line due to both the adiabatic mirror force and nonlinear wave-particle interactions. Thus, the frequency of the chorus elements generated by such electrons and propagating equatorward is higher compared with the elements propagating away from the equator. |
英文关键词 | VLF chorus BWO model |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000529097700048 |
WOS关键词 | CYCLOTRON MASER ; VLF EMISSIONS ; GENERATION ; MAGNETOSPHERE ; MICROBURSTS ; INSTRUMENT ; DYNAMICS ; PLASMA |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/279792 |
专题 | 气候变化 |
作者单位 | 1.Polar Geophys Inst, Apatity, Russia; 2.Russian Acad Sci, Inst Appl Phys, Nizhnii Novgorod, Russia; 3.Czech Acad Sci, Inst Atmospher Phys, Dept Space Phys, Prague, Czech Republic; 4.Charles Univ Prague, Fac Math & Phys, Prague, Czech Republic |
推荐引用方式 GB/T 7714 | Demekhov, A. G.,Taubenschuss, U.,Hanzelka, M.,et al. Frequency Dependence of Very Low Frequency Chorus Poynting Flux in the Source Region: THEMIS Observations and a Model[J]. GEOPHYSICAL RESEARCH LETTERS,2020,47(6). |
APA | Demekhov, A. G.,Taubenschuss, U.,Hanzelka, M.,&Santolik, O..(2020).Frequency Dependence of Very Low Frequency Chorus Poynting Flux in the Source Region: THEMIS Observations and a Model.GEOPHYSICAL RESEARCH LETTERS,47(6). |
MLA | Demekhov, A. G.,et al."Frequency Dependence of Very Low Frequency Chorus Poynting Flux in the Source Region: THEMIS Observations and a Model".GEOPHYSICAL RESEARCH LETTERS 47.6(2020). |
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