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MMS Direct Observations of Kinetic-scale Shock Self-reformation
Alternative TitleWOS:000574529500001
Yang, Zhongwei1,2; Liu, Ying D.; Johlander, Andreas4; Parks, George K.; Lavraud, Benoit6; Lee, Ensang7; Baumjohann, Wolfgang8; Wang, Rui; Burch, James L.
Source PublicationASTROPHYSICAL JOURNAL LETTERS
2020
Volume901Issue:1Pages:L6
DOI10.3847/2041-8213/abb3ff
ISSN2041-8205
Language英语
KeywordShocks Solar-planetary interactions Plasma astrophysics QUASI-PERPENDICULAR SHOCKS COLLISIONLESS-SHOCK NONSTATIONARITY PLASMA ION ACCELERATION REGIONS WIND
AbstractStudies of shocks have long suggested that a shock can undergo cyclical self-reformation on a timescale of ion cyclotron period. This process has been proposed as a primary mechanism for energy dissipation and energetic particle acceleration at shocks. Unambiguous observational evidence, however, has remained elusive. Here, we report direct observations for the self-reformation process of a collisionless, high Mach number, quasi-perpendicular shock using Magnetospheric Multiscale (MMS) measurements. We find that reflected ions by the old shock ramp form a clear phase-space vortex, which gives rise to a new ramp. The new ramp observed by MMS2 has not yet developed to a mature stage during the self-reformation, and is not strong enough to reflect incident ions. Consequently, these ions are only slightly slowed down and show a flat velocity profile from the new ramp all the way to the old one. The present results provide direct evidence of shock self-reformation, and also shed light on energy dissipation and energetic particle acceleration at collisionless shocks throughout the universe.
Indexed BySCI
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Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/7577
Collection中国科学院国家空间科学中心
Affiliation1.Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing 100190, Peoples R China
2.Polar Res Inst China, Key Lab Polar Sci, MNR, Shanghai 200136, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing 100029, Peoples R China
4.Liu, Ying D.] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
5.Univ Helsinki, Helsinki, Finland
6.Parks, George K.] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA
7.Univ Toulouse, Inst Rech Astrophys & Planetol, Toulouse, France
8.Kyung Hee Univ, Yongin, South Korea
9.Austrian Acad Sci, Space Res Inst, Graz, Austria
10.Burch, James L.] Southwest Res Inst, San Antonio, TX USA
Recommended Citation
GB/T 7714
Yang, Zhongwei,Liu, Ying D.,Johlander, Andreas,et al. MMS Direct Observations of Kinetic-scale Shock Self-reformation[J]. ASTROPHYSICAL JOURNAL LETTERS,2020,901(1):L6.
APA Yang, Zhongwei.,Liu, Ying D..,Johlander, Andreas.,Parks, George K..,Lavraud, Benoit.,...&Burch, James L..(2020).MMS Direct Observations of Kinetic-scale Shock Self-reformation.ASTROPHYSICAL JOURNAL LETTERS,901(1),L6.
MLA Yang, Zhongwei,et al."MMS Direct Observations of Kinetic-scale Shock Self-reformation".ASTROPHYSICAL JOURNAL LETTERS 901.1(2020):L6.
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