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Lower Hybrid Waves ...
Lower Hybrid Waves at the Magnetosheath Separatrix Region
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- Tang, B-B (författare)
- Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China.
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- Li, W. Y. (författare)
- Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China.
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- Graham, Daniel B. (författare)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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- Wang, C. (författare)
- Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China.;Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China.
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- Khotyaintsev, Yu, V (författare)
- Swedish Inst Space Phys, Uppsala, Sweden.
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- Le, A. (författare)
- Los Alamos Natl Lab, Plasma Theory & Applicat, Los Alamos, NM USA.
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- Giles, B. L. (författare)
- NASA, Goddard Space Flight Ctr, Greenbelt, MD USA.
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- Lindqvist, Per-Arne (författare)
- KTH,Rymd- och plasmafysik,KTH Royal Inst Technol, Sch Elect Engn, Space & Plasma Phys, Stockholm, Sweden.
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- Ergun, R. E. (författare)
- Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80309 USA.
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- Burch, J. L. (författare)
- Southwest Res Inst, San Antonio, TX USA.
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- Khotyaintsev, Yuri V. (författare)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China Institutet för rymdfysik, Uppsalaavdelningen (creator_code:org_t)
- American Geophysical Union (AGU), 2020
- 2020
- Engelska.
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Ingår i: Geophysical Research Letters. - : American Geophysical Union (AGU). - 0094-8276 .- 1944-8007. ; 47:20
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- 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. 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.
Ämnesord
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
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- Av författaren/redakt...
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Tang, B-B
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Li, W. Y.
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Graham, Daniel B ...
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Wang, C.
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Khotyaintsev, Yu ...
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Le, A.
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visa fler...
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Giles, B. L.
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Lindqvist, Per-A ...
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Ergun, R. E.
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Burch, J. L.
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Khotyaintsev, Yu ...
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visa färre...
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