Statistical Analysis of Whistler Precursors Upstream of Foreshock Transient Shocks: MMS Observations

Wang, Mengmeng1,2; Liu, Terry Z.3; Zhang, Hui1; Liu, Kaijun2; Shi, Quanqi1; Guo, Ruilong1; Tian, Anmin1; Sun, Weijie4; Shen, Xiao-Chen5; Wu, Siyuan2,6; Degeling, Alexander W.1; Wang, Yan2; Bai, Shi-Chen1,7; Yao, Zhonghua8; Li, Wenya9; Zhang, Shuai2; Pitkanen, Timo1,10; Yao, Shutao1; Liu, Ji11; Cheng, Kun2; Ma, Xiao1; Liu, Yuqi2

2024-04-28

10.1029/2023GL105617

GEOPHYSICAL RESEARCH LETTERS   影响因子和分区

0094-8276

1944-8007

["Using the high-time-resolution data from the Magnetospheric Multiscale mission, precursor waves upstream of foreshock transient (FT) shocks are statistically investigated using the four-spacecraft timing method. The wave frequencies and wave vectors determined in the plasma rest frame (PRF) are shown to follow the cold plasma dispersion relation for whistler waves. Combining with the feature of the right-hand polarization in the PRF, the precursors are identified as whistler-mode waves around the lower hybrid frequency. The occurrence of whistler precursors is independent of the Alfv & eacute;n Mach number and the FT shock normal angle. More importantly, all the whistler precursors have group velocities pointing upstream in the shock frame, suggesting the dispersive radiation to be a possible generation mechanism. The study improves the understanding of not only the whistler precursors but also the overall FT shock dynamics.","The characteristics of the precursor waves upstream of foreshock transient (FT) shocks are determined in the plasma rest frame using the multi-point measurements from the Magnetospheric Multiscale mission with appropriate separation scales. The statistical results demonstrate for the first time that the precursors upstream of FT shocks are lower hybrid frequency whistler-mode waves. The presence or absence of large amplitude whistler precursors does not depend on the FT shock normal angle and the Alfv & eacute;n Mach number. These results have important implications on the nature of the whistler precursors and the dynamics of the FT shocks.","Precursor waves upstream of foreshock transient shocks are found to follow the whistler wave dispersion relation in the plasma rest frame The occurrence of whistler precursors is independent of the Alfv & eacute;n Mach numbers and normal angles of the foreshock transient shocks The observed wave characteristics are consistent with that the precursors are generated through the dispersive radiation mechanism"]

SCI ; EI

英语

通讯

null[42225405] ; null[42275135]

Geology

Geosciences, Multidisciplinary

WOS:001206327700001

AMER GEOPHYSICAL UNION

GEOSCIENCES

Web of Science

1.Shandong Univ, Inst Space Sci, Shandong Prov Key Lab Opt Astron Solar Terr Envir, Weihai, Peoples R China
2.Southern Univ Sci & Technol, Dept Earth & Space Sci, Shenzhen, Peoples R China
3.Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA USA
4.Univ Calif Berkeley, Space Sci Lab, Berkeley, CA USA
5.Boston Univ, Ctr Space Phys, Boston, MA USA
6.Univ Paris Cite, Sorbonne Univ, Univ PSL, CNRS,LESIA,Observ Paris, Meudon, France
7.Shandong Univ, Sch Math & Stat, Weihai, Peoples R China
8.Univ Hong Kong, Dept Earth Sci, Hong Kong, Peoples R China
9.Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China
10.Umea Univ, Dept Phys, Umea, Sweden
11.Univ Alberta, Dept Phys, Edmonton, AB, Canada

Wang, Mengmeng,Liu, Terry Z.,Zhang, Hui,et al. Statistical Analysis of Whistler Precursors Upstream of Foreshock Transient Shocks: MMS Observations[J]. GEOPHYSICAL RESEARCH LETTERS,2024,51(8).

Wang, Mengmeng.,Liu, Terry Z..,Zhang, Hui.,Liu, Kaijun.,Shi, Quanqi.,...&Liu, Yuqi.(2024).Statistical Analysis of Whistler Precursors Upstream of Foreshock Transient Shocks: MMS Observations.GEOPHYSICAL RESEARCH LETTERS,51(8).

Wang, Mengmeng,et al."Statistical Analysis of Whistler Precursors Upstream of Foreshock Transient Shocks: MMS Observations".GEOPHYSICAL RESEARCH LETTERS 51.8(2024).