Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019GL085220 |
Generation and Characteristics of Unusual High Frequency EMIC Waves | |
Teng, S.1,2,3; Li, W.3; Tao, X.1,2; Ma, Q.3,4; Wu, Y.1,2; Capannolo, L.3; Shen, X-C3; Gan, L.3 | |
2019-12-20 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2019 |
文章类型 | Article;Early Access |
语种 | 英语 |
国家 | Peoples R China; USA |
英文摘要 | We report unusual Electromagnetic Ion Cyclotron (EMIC) waves with a very narrow frequency bandwidth, closely following and approaching the proton gyrofrequency. One interesting case analysis shows that magnetosonic waves, anisotropic suprathermal proton distributions, and high frequency EMIC waves are closely related. Magnetosonic waves potentially cause the resonant heating of suprathermal protons and the temperature anisotropy of suprathermal protons (10-100 eV) likely provides free energy for the excitation of high frequency EMIC waves. The statistical analysis shows that this type of EMIC waves has a typical wave amplitude of similar to 100 pT, left-handed polarization, and small wave normal angles. Moreover, these low frequency EMIC waves typically occur near the equator in the low-density regions from dawn to dusk. These newly observed high frequency EMIC waves provide new insights into understanding the generation of EMIC waves and the energy transfer between magnetosonic waves and EMIC waves. Plain Language Summary Electromagnetic Ion Cyclotron (EMIC) waves are commonly observed in the Earth's magnetosphere and play an important role in causing the loss of ring current ions and relativistic electrons due to pitch angle scattering. In this study, we report unusual high frequency EMIC waves with frequency very close to the proton gyrofrequency. An interesting case study clearly shows the correlation between magnetosonic waves, the enhancement of suprathermal protons, and high frequency EMIC waves. The protons at suprathermal energies could be heated by magnetosonic waves and the anisotropic distribution of suprathermal protons is likely responsible for the excitation of high frequency EMIC waves. The statistical analysis shows that this type of EMIC waves has a typical wave amplitude of similar to 100 pT, left-handed polarization, and small wave normal angles. These newly observed high frequency EMIC waves provide new insights into understanding the generation of EMIC waves and the energy transfer between magnetosonic waves and EMIC waves. |
英文关键词 | high frequency EMIC wave energy transfer magnetosonic wave proton heating |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000503593100001 |
WOS关键词 | ION-CYCLOTRON WAVES ; VAN ALLEN PROBES ; RELATIVISTIC ELECTRON-PRECIPITATION ; DISPERSION-RELATION ; MAGNETOSONIC WAVES ; PROTON ; INSTABILITIES ; PARTICLE ; MAGNETOSPHERE ; PROPAGATION |
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/225227 |
专题 | 环境与发展全球科技态势 |
作者单位 | 1.Univ Sci & Technol China, Dept Geophys & Planetary Sci, CAS Key Lab Geospace Environm, Hefei, Anhui, Peoples R China; 2.CAS Ctr Excellence Comparat Planetol, Hefei, Anhui, Peoples R China; 3.Boston Univ, Ctr Space Phys, Boston, MA 02215 USA; 4.Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA USA |
推荐引用方式 GB/T 7714 | Teng, S.,Li, W.,Tao, X.,et al. Generation and Characteristics of Unusual High Frequency EMIC Waves[J]. GEOPHYSICAL RESEARCH LETTERS,2019. |
APA | Teng, S..,Li, W..,Tao, X..,Ma, Q..,Wu, Y..,...&Gan, L..(2019).Generation and Characteristics of Unusual High Frequency EMIC Waves.GEOPHYSICAL RESEARCH LETTERS. |
MLA | Teng, S.,et al."Generation and Characteristics of Unusual High Frequency EMIC Waves".GEOPHYSICAL RESEARCH LETTERS (2019). |
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