Title: Lower Hybrid Waves at the Magnetosheath Separatrix Region

Abstract

Lower 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. Furthermore, 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.

Authors:

Tang, B. ‐B.  ^[1];

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• Search DOE PAGES for ORCID "0000-0002-9244-1828"

Li, W. Y.  ^[1];

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Graham, D. B.  ^[2];

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Wang, C.  ^[3];

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Khotyaintsev, Yu. V.  ^[2];

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Le, Ari Yitzchak  ^[4];

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Giles, Barbara L.  ^[5];

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Lindqvist, P. ‐A.  ^[6];

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Ergun, R. E.  ^[7];

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Burch, J. L.  ^[8]

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+ Show Author Affiliations

1. Chinese Academy of Sciences (CAS), Beijing (China)
2. Swedish Inst. of Space Physics, Uppsala (Sweden)
3. Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Chinese Academy of Sciences, Beijing (China)
4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
5. NASA Goddard Space Flight Center, Greenbelt, MD (United States)
6. KTH Royal Inst. of Technology, Stockholm (Sweden)
7. Univ. of Colorado, Boulder, CO (United States)
8. Southwest Research Inst., San Antonio, TX (United States)

Publication Date:

Wed Oct 07 00:00:00 EDT 2020

Research Org.:

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Org.:

USDOE Laboratory Directed Research and Development (LDRD) Program; National Natural Science Foundation of China (NSFC); Chinese Academy of Sciences

OSTI Identifier:

1868267

Report Number(s):

LA-UR-20-27264
Journal ID: ISSN 0094-8276

Grant/Contract Number:  

89233218CNA000001; 41974196; 41974170; 41731070; QYZDJ-SSW-JSC028; XDA15052500; XDA17010301; XDB 41000000

Resource Type:

Accepted Manuscript

Journal Name:

Geophysical Research Letters

Additional Journal Information:

Journal Volume: 47; Journal Issue: 20; Journal ID: ISSN 0094-8276

Publisher:

American Geophysical Union (AGU)

Country of Publication:

United States

Language:

English

Subject:

58 GEOSCIENCES