Propagation properties of foreshock cavitons: Cluster observations
文献类型：期刊论文
| 作者 | Wang, MengMeng1,2; Yao, ShuTao1; Shi, QuanQi1; Zhang, Hui3; Tian, AnMin1; Degeling, Alexander William1; Zhang, Shuai1; Guo, RuiLong4; Sun, WeiJie5; Liu, Ji2 |
| 刊名 | SCIENCE CHINA-TECHNOLOGICAL SCIENCES
 |
| 出版日期 | 2020 |
| 卷号 | 63期号:1页码:173-182 |
| 关键词 | foreshock transient phenomena cavitons nonlinear evolution of ULF waves propagation and evolution properties of structures multipoint spacecraft methods |
| ISSN号 | 1674-7321 |
| DOI | 10.1007/s11431-018-9450-3 |
| 英文摘要 | Foreshock cavitons are transient phenomena observed in the terrestrial foreshock region. They are characterized by a simultaneous depression of magnetic field magnitude and plasma density, which are bounded with enhancements of these two parameters and surrounded by ultralow frequency (ULF) waves. Previous studies focused on the interplanetary magnetic field (IMF) conditions, solar wind (SW) conditions, and the growth of the foreshock waves related to the generation of foreshock cavitons. Previously, a multipoint spacecraft analysis method using Cluster data was applied to analyze only two foreshock cavitons, and this method did not consider uncertainties. In this study, multipoint spacecraft analysis methods, including the timing method, the minimum directional derivative (MDD) method, and the spatiotemporal difference (STD) method are applied to determine the velocity in both spacecraft and solar wind frames. The propagation properties show good agreement with previous results from simulations and observations that most cavitons move sunward in the solar wind frame, with the velocities larger than the Alfven speed. The propagation properties of foreshock cavitons support the formation mechanism of cavitons in previous simulations, which suggested that cavitons are formed due to the nonlinear evolution of compressive ULF waves. We find that there is clear decreasing trend between the size of cavitons and their velocity in the solar wind frame. In addition, the timing method considering errors has been applied to study the evolution properties by comparing the velocities with errors of the leading and trailing edges, and we identify three stable cavitons and one contracting caviton, which has not been studied before. Most cavitons should remain stable when they travel toward the Earth's bow shock. The relationship between the size of foreshock cavitons and their distance from the bow shock is also discussed. |
| WOS关键词 | HOT FLOW ANOMALIES ; MAGNETIC HOLES ; SOLAR-WIND ; BOW SHOCK ; ULF WAVES ; GENERATION ; CAVITIES ; EVENTS |
| WOS研究方向 | Engineering ; Materials Science |
| 语种 | 英语 |
| WOS记录号 | WOS:000511855100016 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/95691]  |
| 专题 | 地质与地球物理研究所_中国科学院地球与行星物理重点实验室 |
| 通讯作者 | Shi, QuanQi |
| 作者单位 | 1.Shandong Univ, Sch Space Sci & Phys, Weihai 264209, Peoples R China 2.Chinese Acad Sci, Natl Space Sci Ctr, Beijing 100190, Peoples R China 3.Univ Alaska Fairbanks, Inst Geophys, Fairbanks, AK 99775 USA 4.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 5.Univ Michigan, Dept Climate & Space Sci & Engn, Ann Arbor, MI 48113 USA 6.Peking Univ, Inst Space Phys & Appl Technol, Beijing 100871, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, MengMeng,Yao, ShuTao,Shi, QuanQi,et al. Propagation properties of foreshock cavitons: Cluster observations[J]. SCIENCE CHINA-TECHNOLOGICAL SCIENCES,2020,63(1):173-182. |
| APA | Wang, MengMeng.,Yao, ShuTao.,Shi, QuanQi.,Zhang, Hui.,Tian, AnMin.,...&Pu, ZuYin.(2020).Propagation properties of foreshock cavitons: Cluster observations.SCIENCE CHINA-TECHNOLOGICAL SCIENCES,63(1),173-182. |
| MLA | Wang, MengMeng,et al."Propagation properties of foreshock cavitons: Cluster observations".SCIENCE CHINA-TECHNOLOGICAL SCIENCES 63.1(2020):173-182. |
入库方式： OAI收割
来源：地质与地球物理研究所
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