Ionospheric Outflow During the Substorm Growth Phase: THEMIS Observations of Oxygen Ions at the Plasma Sheet Boundary
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作者:
Artemyev, A., V
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Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90024 USA
Space Sci Inst, Moscow, RussiaUniv Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90024 USA
Artemyev, A., V
[1
,2
]
Angelopoulos, V
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Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90024 USAUniv Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90024 USA
Angelopoulos, V
[1
]
Runov, A.
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Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90024 USAUniv Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90024 USA
Runov, A.
[1
]
Zhang, X-J
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Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90024 USAUniv Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90024 USA
Zhang, X-J
[1
]
机构:
[1] Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90024 USA
Ionospheric outflow is an important plasma source that feeds the near-Earth magnetotail with heavy oxygen ions. Because these ions can significantly alter the structure and stability of the magnetotail current sheet, the characteristics of this outflow are important for accurate magnetosphere modeling, including modeling of substorms-a key element of magnetosphere dynamics. Using Time History of Events and Macroscale Interactions during Substorms (THEMIS) spacecraft measurements in the magnetotail (around the plasma sheet boundary), we investigate characteristics oxygen outflows observed during substorm growth phases. The observed oxygen ion temperature and flow energy indicate that the outflow is marginally stable to ion acoustic wave generation: The oxygen temperature is slightly lower than the electron temperature and slightly higher than the oxygen flow energy. Moreover, the observed outflows are accompanied by low frequency electrostatic waves that may contribute to outflow thermalization. The oxygen bulk velocity has a significant component directed toward the equatorial plane, originating from the cross-field drift in the convection electric field. The estimated radial distances at which oxygen ions reach the plasma sheet are similar to 20-40R(E)downtail, that is, outflows during substorm growth phases can alter current sheet characteristics around the potential magnetic reconnection region.
机构:
Shandong Univ, Inst Space Sci, Weihai 264209, Shandong, Peoples R China
Univ Sci & Technol China, Sch Earth & Space Sci, Hefei 230026, Anhui, Peoples R ChinaShandong Univ, Inst Space Sci, Weihai 264209, Shandong, Peoples R China
Tang, C. L.
Li, Z. Y.
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Univ Sci & Technol China, Sch Earth & Space Sci, Hefei 230026, Anhui, Peoples R ChinaShandong Univ, Inst Space Sci, Weihai 264209, Shandong, Peoples R China
Li, Z. Y.
Angelopoulos, V.
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Univ Calif Los Angeles, Dept Earth & Space Sci, Los Angeles, CA 90095 USAShandong Univ, Inst Space Sci, Weihai 264209, Shandong, Peoples R China
Angelopoulos, V.
Mende, S. B.
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Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USAShandong Univ, Inst Space Sci, Weihai 264209, Shandong, Peoples R China
Mende, S. B.
Glassmeier, K. H.
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TUBS, D-38106 Braunschweig, GermanyShandong Univ, Inst Space Sci, Weihai 264209, Shandong, Peoples R China
Glassmeier, K. H.
Donovan, E.
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Univ Calgary, Dept Phys & Astron, Calgary, AB T2N 1N4, CanadaShandong Univ, Inst Space Sci, Weihai 264209, Shandong, Peoples R China
Donovan, E.
Russell, C. T.
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Univ Calif Los Angeles, Dept Earth & Space Sci, Los Angeles, CA 90095 USAShandong Univ, Inst Space Sci, Weihai 264209, Shandong, Peoples R China
Russell, C. T.
Lu, L.
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Chinese Acad Sci, Ctr Space Sci & Appl Res, Beijing 100080, Peoples R ChinaShandong Univ, Inst Space Sci, Weihai 264209, Shandong, Peoples R China
机构:
Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90095 USA
Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R ChinaUniv Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90095 USA
Zhou, X. -Z.
Angelopoulos, V.
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Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90095 USAUniv Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90095 USA
Angelopoulos, V.
Runov, A.
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Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90095 USAUniv Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90095 USA
Runov, A.
Sitnov, M. I.
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Johns Hopkins Univ, Appl Phys Lab, Laurel, MD USAUniv Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90095 USA
Sitnov, M. I.
Coroniti, F.
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Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA USAUniv Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90095 USA
Coroniti, F.
Pritchett, P.
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Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA USAUniv Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90095 USA
Pritchett, P.
Pu, Z. Y.
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Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R ChinaUniv Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90095 USA
Pu, Z. Y.
Zong, Q. -G.
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Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China
Univ Massachusetts, Ctr Atmospher Res, Lowell, MA USAUniv Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90095 USA
Zong, Q. -G.
McFadden, J. P.
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Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USAUniv Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90095 USA
McFadden, J. P.
Larson, D.
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Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USAUniv Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90095 USA
Larson, D.
Glassmeier, K. -H.
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TU Braunschweig, Inst Geophys & Extraterr Phys, Braunschweig, GermanyUniv Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90095 USA
机构:
Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90095 USA
Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USAUniv Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90095 USA
El-Alaoui, Mostafa
Richard, Robert L.
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Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90095 USA
Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USAUniv Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90095 USA
Richard, Robert L.
Ashour-Abdalla, Maha
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Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90095 USA
Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USAUniv Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90095 USA
Ashour-Abdalla, Maha
Goldstein, Melvyn L.
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NASA, Goddard Space Flight Ctr, Heliospher Phys Lab, Greenbelt, MD 20771 USAUniv Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90095 USA
Goldstein, Melvyn L.
Walker, Raymond J.
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Univ Calif Los Angeles, Dept Earth & Space Sci, Los Angeles, CA 90095 USAUniv Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90095 USA
机构:
Chinese Acad Sci, Ctr Space Sci & Appl Res, State Key Lab Space Weather, Beijing 100190, Peoples R China
Chinese Acad Sci, Grad Univ, Coll Earth Sci, Beijing, Peoples R ChinaChinese Acad Sci, Ctr Space Sci & Appl Res, State Key Lab Space Weather, Beijing 100190, Peoples R China
Ma, Yonghui
Shen, Chao
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Chinese Acad Sci, Ctr Space Sci & Appl Res, State Key Lab Space Weather, Beijing 100190, Peoples R ChinaChinese Acad Sci, Ctr Space Sci & Appl Res, State Key Lab Space Weather, Beijing 100190, Peoples R China
Shen, Chao
Angelopoulos, V.
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Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90024 USAChinese Acad Sci, Ctr Space Sci & Appl Res, State Key Lab Space Weather, Beijing 100190, Peoples R China
Angelopoulos, V.
Lui, A. T. Y.
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机构:
Johns Hopkins Univ, Appl Phys Lab, Laurel, MD USAChinese Acad Sci, Ctr Space Sci & Appl Res, State Key Lab Space Weather, Beijing 100190, Peoples R China
Lui, A. T. Y.
Li, Xinlin
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机构:
Univ Colorado, LASP, Boulder, CO 80309 USA
Univ Colorado, Dept Aerosp Engn Sci, Boulder, CO 80309 USAChinese Acad Sci, Ctr Space Sci & Appl Res, State Key Lab Space Weather, Beijing 100190, Peoples R China
Li, Xinlin
Frey, H. U.
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Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USAChinese Acad Sci, Ctr Space Sci & Appl Res, State Key Lab Space Weather, Beijing 100190, Peoples R China
Frey, H. U.
Dunlop, M.
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机构:
Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, EnglandChinese Acad Sci, Ctr Space Sci & Appl Res, State Key Lab Space Weather, Beijing 100190, Peoples R China
Dunlop, M.
Auster, H. U.
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Tech Univ Carolo Wilhelmina Braunschweig, IGEP, D-38106 Braunschweig, GermanyChinese Acad Sci, Ctr Space Sci & Appl Res, State Key Lab Space Weather, Beijing 100190, Peoples R China
Auster, H. U.
McFadden, J. P.
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Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USAChinese Acad Sci, Ctr Space Sci & Appl Res, State Key Lab Space Weather, Beijing 100190, Peoples R China
McFadden, J. P.
Larson, D.
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Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USAChinese Acad Sci, Ctr Space Sci & Appl Res, State Key Lab Space Weather, Beijing 100190, Peoples R China
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Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA 90095 USAUniv Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA 90095 USA
Wang, Chih-Ping
Wang, Xueyi
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Auburn Univ, Phys Dept, Auburn, AL USAUniv Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA 90095 USA
Wang, Xueyi
Lin, Yu
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Auburn Univ, Phys Dept, Auburn, AL USAUniv Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA 90095 USA
Lin, Yu
Wing, Simon
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Johns Hopkins Univ, Appl Phys Lab, Laurel, MD USAUniv Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA 90095 USA
Wing, Simon
Hairston, Marc
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Univ Texas Dallas, William B Hanson Ctr Space Sci, Richardson, TX USAUniv Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA 90095 USA