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DOI | 10.1029/2019GL086726 |
On the Ubiquity of Magnetic Reconnection Inside Flux Transfer Event-Like Structures at the Earth's Magnetopause | |
Fargette, N.1; Lavraud, B.1; Oieroset, M.2; Phan, T. D.2; Toledo-Redondo, S.1,3; Kieokaew, R.1; Jacquey, C.1; Fuselier, S. A.4,5; Trattner, K. J.6; Petrinec, S.7; Hasegawa, H.8; Garnier, P.1; Genot, V1; Lenouvel, Q.1; Fadanelli, S.1; Penou, E.1; Sauvaud, J. A.1; Avanov, D. L. A.9; Burch, J.4; Chandler, M. O.10; Coffey, V. N.10; Dorelli, J.9; Eastwood, J. P.11; Farrugia, C. J.12,13; Gershman, D. J.9; Giles, B. L.9; Grigorenko, E.14; Moore, T. E.9; Paterson, W. R.9; Pollock, C.15; Saito, Y.8; Schiff, C.9; Smith, S. E.16 | |
2020-03-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2020 |
卷号 | 47期号:6 |
文章类型 | Article |
语种 | 英语 |
国家 | France; USA; Spain; Japan; England; Russia |
英文摘要 | Flux transfer events (FTEs) are transient phenomena frequently observed at the Earth's magnetopause. Their usual interpretation is a flux rope moving away from the reconnection region. However, the Magnetospheric Multiscale Mission revealed that magnetic reconnection sometimes occurs inside these structures, questioning their flux rope configuration. Here we investigate 229 FTE-type structures and find reconnection signatures inside 19% of them. We analyze their large-scale magnetic topology using electron heat flux and find that it is significantly different across the FTE reconnecting current sheets, demonstrating that they are constituted of two magnetically disconnected structures. We also find that the interplanetary magnetic field (IMF) associated with reconnecting FTEs presents a strong B-y component. We discuss several formation mechanisms to explain these observations. In particular, the maximum magnetic shear model predicts that for large IMF B-y, two spatially distinct X lines coexist at the magnetopause. They can generate separate magnetic flux tubes that may become interlaced. Plain Language Summary The solar wind and the Earth's magnetosphere are two gigantic magnetic structures that collide constantly over our heads, in the near-space environment. At the boundary of their interaction (the magnetopause), the fundamental process of magnetic reconnection can occur. It is there that dynamic magnetic structures called "flux transfer events" are formed. They travel fast along the magnetopause and transport a lot of energy, from the solar wind into the magnetosphere. These structures are yet not well understood, as underlined by the recent observations made by the Magnetospheric Multiscale Mission (MMS), launched in 2015 by National Aeronautics and Space Administration. The four-spacecraft mission, specifically designed to study the physics happening at the magnetopause, is capable of measuring right into these magnetic structures, collecting data on their particles and magnetic field properties. When analyzing MMS data, we found that 19% of the flux transfer events were not constituted of one, but two structures with very different properties. These dual magnetic structures tend to appear when the solar wind's magnetic field is oriented mainly toward the east or the west. From these observations and based on existing models of the magnetopause, we propose a scenario that allows such dual structures to form as interlaced magnetic tubes. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000529097700040 |
WOS关键词 | GENERATION MECHANISM ; SHEAR EVIDENCE ; PLASMA BETA ; WIND ; DEPENDENCE ; TOPOLOGY |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/279827 |
专题 | 气候变化 |
作者单位 | 1.Univ Toulouse, CNES, UPS, Inst Rech Astrophys & Planetol,CNRS, Toulouse, France; 2.Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA; 3.Univ Murcia, Dept Electromagnetism & Elect, Murcia, Spain; 4.Southwest Res Inst, San Antonio, TX USA; 5.Univ Texas San Antonio, Dept Phys, San Antonio, TX USA; 6.Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80309 USA; 7.Lockheed Martin Adv Technol Ctr, Palo Alto, CA USA; 8.JAXA, Inst Space & Astronaut Sci, Sagamihara, Kanagawa, Japan; 9.NASA, Goddard Space Flight Ctr, Greenbelt, MD USA; 10.NASA, Marshall Space Flight Ctr, Huntsville, AL USA; 11.Imperial Coll London, Dept Phys, Blacken Lab, London, England; 12.Univ New Hampshire, Dept Phys, Durham, NH 03824 USA; 13.Univ New Hampshire, Space Sci Ctr, Durham, NH 03824 USA; 14.Russian Acad Sci, Space Res Inst, Moscow, Russia; 15.Denali Sci, Fairbanks, AK USA; 16.Catholic Univ Amer, Dept Phys, Washington, DC 20064 USA |
推荐引用方式 GB/T 7714 | Fargette, N.,Lavraud, B.,Oieroset, M.,et al. On the Ubiquity of Magnetic Reconnection Inside Flux Transfer Event-Like Structures at the Earth's Magnetopause[J]. GEOPHYSICAL RESEARCH LETTERS,2020,47(6). |
APA | Fargette, N..,Lavraud, B..,Oieroset, M..,Phan, T. D..,Toledo-Redondo, S..,...&Smith, S. E..(2020).On the Ubiquity of Magnetic Reconnection Inside Flux Transfer Event-Like Structures at the Earth's Magnetopause.GEOPHYSICAL RESEARCH LETTERS,47(6). |
MLA | Fargette, N.,et al."On the Ubiquity of Magnetic Reconnection Inside Flux Transfer Event-Like Structures at the Earth's Magnetopause".GEOPHYSICAL RESEARCH LETTERS 47.6(2020). |
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