Propagation properties of foreshock cavitons: Cluster observations
Alternative TitleWOS:000511855100016;20193107245253
Wang, MengMeng1; Yao, ShuTao; Shi, QuanQi; Zhang, Hui2; Tian, AnMin; Degeling, Alexander William; Zhang, Shuai; Guo, RuiLong3; Sun, WeiJie4; Liu, Ji1; Bai, ShiChen; Shen, XiaoChen; Zhu, XiaoQiong; Fu, SuiYan5; Pu, ZuYin5
Keywordforeshock transient phenomena cavitons nonlinear evolution of ULF waves propagation and evolution properties of structures multipoint spacecraft methods HOT FLOW ANOMALIES MAGNETIC HOLES SOLAR-WIND BOW SHOCK ULF WAVES GENERATION CAVITIES EVENTS
AbstractForeshock 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.
Indexed BySCI ; EI
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Document Type期刊论文
Affiliation1.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
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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.
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