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Lower Hybrid Waves at the Magnetosheath Separatrix Region
Alternative TitleWOS:000586497000031
Tang, B-B; Li, W. Y.; Graham, D. B.; Wang, C.; Khotyaintsev, Yu, V4; Le, A.; Giles, B. L.; Lindqvist, P-A; Ergun, R. E.; Burch, J. L.
Source PublicationGEOPHYSICAL RESEARCH LETTERS
2020
Volume47Issue:20Pages:e2020GL089880
DOI10.1029/2020GL089880
ISSN0094-8276
Language英语
KeywordMAGNETIC RECONNECTION MAGNETOPAUSE DIFFUSION
AbstractLower hybrid waves are investigated at the magnetosheath separatrix region in asymmetric guide field reconnection by using the Magnetospheric Multiscale (MMS) mission. Three of the four MMS spacecraft observe clear wave activities around the lower hybrid frequency across the magnetosheath separatrix, where a density gradient is present. The observed waves are consistent with generation by the lower hybrid drift instability. The characteristic properties of these waves include the following: (1) the waves propagate toward the x-line in the spacecraft frame due to the large out-of-plane magnetic field, which is in the same direction of the diamagnetic drift of the x-line; (2) the wave potential is about 20% of the electron temperature. These drift waves effectively produce cross-field particle diffusion, enabling the transport of magnetosheath electrons into the exhaust region. At last, we suggest that the lower hybrid waves at the magnetosheath separatrix region represent some unique features of asymmetric guide field reconnection, which is different from that widely observed at the magnetospheric side of magnetopause reconnection. Plain Language Summary Magnetic reconnection is a fundamental process of explosive energy conversion in space, and one important unresolved issue during this process is how plasma waves impact the magnetic reconnection. Different types of waves have been found and investigated during reconnection, including kinetic Alfven waves, lower hybrid waves, whistler waves, upper hybrid waves, and parallel electrostatic waves. Among these waves, lower hybrid waves, taken as a basic feature of 3-D asymmetric reconnection, are frequently observed at the magnetospheric side. In this study, we present new observations from the Magnetospheric Multiscale (MMS) mission, showing that the lower hybrid waves can also be found at the magnetosheath separatrix in asymmetric guide field reconnection, which enable the cross-field particle diffusion from the magnetosheath to the exhaust. These results can help deepen our understanding of the roles of plasma waves in reconnection.
Indexed BySCI
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Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/7571
Collection中国科学院国家空间科学中心
Affiliation1.[Tang, B-B
2.Li, W. Y.
3.Wang, C.] Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China
4.[Graham, D. B.
5.Swedish Inst Space Phys, Uppsala, Sweden
6.[Wang, C.] Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China
7.[Le, A.] Los Alamos Natl Lab, Plasma Theory & Applicat, Los Alamos, NM USA
8.[Giles, B. L.] NASA, Goddard Space Flight Ctr, Greenbelt, MD USA
9.KTH Royal Inst Technol, Sch Elect Engn, Space & Plasma Phys, Stockholm, Sweden
10.[Ergun, R. E.] Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80309 USA
11.[Burch, J. L.] Southwest Res Inst, San Antonio, TX USA
Recommended Citation
GB/T 7714
Tang, B-B,Li, W. Y.,Graham, D. B.,et al. Lower Hybrid Waves at the Magnetosheath Separatrix Region[J]. GEOPHYSICAL RESEARCH LETTERS,2020,47(20):e2020GL089880.
APA Tang, B-B.,Li, W. Y..,Graham, D. B..,Wang, C..,Khotyaintsev, Yu, V.,...&Burch, J. L..(2020).Lower Hybrid Waves at the Magnetosheath Separatrix Region.GEOPHYSICAL RESEARCH LETTERS,47(20),e2020GL089880.
MLA Tang, B-B,et al."Lower Hybrid Waves at the Magnetosheath Separatrix Region".GEOPHYSICAL RESEARCH LETTERS 47.20(2020):e2020GL089880.
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