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Lower Hybrid Waves at the Magnetosheath Separatrix Region

Journal Article · · Geophysical Research Letters
DOI:https://doi.org/10.1029/2020gl089880· OSTI ID:1868267
 [1];  [1];  [2];  [3];  [2];  [4];  [5];  [6];  [7];  [8]
  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)
+ Show Author Affiliations

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.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
LDRD; National Natural Science Foundation of China; Chinese Academy of Sciences
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1868267
Report Number(s):
LA-UR-20-27264
Journal Information:
Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 20 Vol. 47; ISSN 0094-8276
Publisher:
American Geophysical Union (AGU)Copyright Statement
Country of Publication:
United States
Language:
English

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