Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018GL081500 |
Magnetospheric Chorus, Exohiss, and Magnetosonic Emissions Simultaneously Modulated by Fundamental Toroidal Standing Alfven Waves Following Solar Wind Dynamic Pressure Fluctuations | |
Liu, Nigang1,2,3,4; Su, Zhenpeng1,2,3; Gao, Zhonglei5,6; Zheng, Huinan1,2,3; Wang, Yuming1,2,3; Wang, Shui1,2,3 | |
2019-02-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2019 |
卷号 | 46期号:4页码:1900-1910 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China |
英文摘要 | Magnetospheric quasiperiodic whistler-mode emissions have long been considered a consequence of the relaxation oscillation or the compressional ultralow-frequency wave modulation. Here we experimentally demonstrate that the whistler-mode chorus, exohiss, and magnetosonic emissions can be effectively modulated by the toroidal ultralow-frequency waves. On 04 August 2017, the solar wind dynamic pressure fluctuations excited the fundamental toroidal standing Alfven waves in the dayside magnetosphere. These regular toroidal pulsations displayed the approximately same periods as the power variations of the whistler-mode emissions from 50Hz to 5kHz. Along with the decay of the toroidal pulsations, the quasiperiodic feature of these whistler-mode emissions gradually became indistinct. However, no modulation signatures of background parameters and resonant particles for the whistler-mode emissions were observable near the equator, and the exact cause for this phenomenon remains to be elucidated. Plain Language Summary Whistler-mode emissions contribute significantly to the Van Allen radiation belt electron dynamics, and their power can exhibit quasiperiodic variations on a timescale of tens of seconds to several minutes in the dayside magnetosphere. Since the 1960s, the quasiperiodic whistler-mode emissions have been considered a consequence of the relaxation oscillation or the compressional ultralow-frequency wave modulation. Using the Van Allen Probes data, we reveal here new physical mechanism for the quasiperiodic whistler-mode emissions: The solar wind dynamic pressure fluctuations trigger the magnetospheric fundamental toroidal standing Alfven waves and then modulate the whistler-mode chorus, exohiss, and magnetosonic emissions from 50 Hz to 5 kHz. Further investigation of this unexpected phenomenon may deepen our understanding of the growth and propagation of whistler-mode emissions and facilitate the radiation belt model developments. |
英文关键词 | radiation belt wave-particle interaction plasma instability quasi-periodic VLF ELF waves ULF pulsations solar wind dynamic pressure fluctuations |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000461855600002 |
WOS关键词 | VAN ALLEN PROBES ; WHISTLER-MODE CHORUS ; FREQUENCY GEOMAGNETIC-PULSATIONS ; CHARGED-PARTICLE BEHAVIOR ; ELF-VLF EMISSIONS ; PLASMASPHERIC HISS ; ULF WAVES ; CLUSTER OBSERVATIONS ; MAGNETIC PULSATIONS ; GENERATION |
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/28589 |
专题 | 气候变化 |
作者单位 | 1.Univ Sci & Technol China, Dept Geophys & Planetary Sci, CAS Key Lab Geospace Environm, Hefei, Anhui, Peoples R China; 2.Univ Sci & Technol China, Collaborat Innovat Ctr Astronaut Sci & Technol, Hefei, Anhui, Peoples R China; 3.CAS Ctr Excellence Comparat Planetol, Hefei, Anhui, Peoples R China; 4.Univ Sci & Technol China, Mengcheng Natl Geophys Observ Sch Earth & Space S, Hefei, Anhui, Peoples R China; 5.Harbin Inst Technol, Inst Space Sci & Appl Technol, Shenzhen, Peoples R China; 6.Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Changsha, Hunan, Peoples R China |
推荐引用方式 GB/T 7714 | Liu, Nigang,Su, Zhenpeng,Gao, Zhonglei,et al. Magnetospheric Chorus, Exohiss, and Magnetosonic Emissions Simultaneously Modulated by Fundamental Toroidal Standing Alfven Waves Following Solar Wind Dynamic Pressure Fluctuations[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(4):1900-1910. |
APA | Liu, Nigang,Su, Zhenpeng,Gao, Zhonglei,Zheng, Huinan,Wang, Yuming,&Wang, Shui.(2019).Magnetospheric Chorus, Exohiss, and Magnetosonic Emissions Simultaneously Modulated by Fundamental Toroidal Standing Alfven Waves Following Solar Wind Dynamic Pressure Fluctuations.GEOPHYSICAL RESEARCH LETTERS,46(4),1900-1910. |
MLA | Liu, Nigang,et al."Magnetospheric Chorus, Exohiss, and Magnetosonic Emissions Simultaneously Modulated by Fundamental Toroidal Standing Alfven Waves Following Solar Wind Dynamic Pressure Fluctuations".GEOPHYSICAL RESEARCH LETTERS 46.4(2019):1900-1910. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论