globalchange  > 科学计划与规划
DOI: 10.1002/2015GL067117
论文题名:
Scaling laws for magnetic reconnection, set by regulation of the electron pressure anisotropy to the firehose threshold
作者: Ohia O.; Egedal J.; Lukin V.S.; Daughton W.; Le A.
刊名: Geophysical Research Letters
ISSN: 0094-8294
EISSN: 1944-8025
出版年: 2015
卷: 42, 期:24
起始页码: 10549
结束页码: 10556
语种: 英语
英文关键词: electron anisotropy ; electron energization ; magnetic reconnection ; plasma simulation
Scopus关键词: Anisotropy ; Collisional plasmas ; Electrons ; Equations of state ; Magnetic fields ; Magnetism ; Magnetosphere ; Plasma density ; Plasma simulation ; Earth's magnetosphere ; Electron anisotropy ; Electron energization ; Electron pressures ; Guide magnetic field ; Magnetic field strengths ; Magnetic reconnections ; Plasma conditions ; Magnetoplasma ; anisotropy ; electric field ; electron ; energy flux ; magnetic field ; magnetization ; magnetosphere ; plasma ; prediction ; spacecraft ; threshold
英文摘要: Magnetic reconnection in a weakly collisional plasma, such as in the Earth's magnetosphere, is known to be accompanied by electron pressure anisotropy. For reconnection scenarios including moderate guide magnetic field, electrons are magnetized throughout the reconnection region, and the anisotropy drives extended electron current layers. Along these layers, the anisotropy nears the firehose threshold. We describe how the anisotropy stagnates at this threshold by a mechanism that does not involve pitch-angle mixing. Using previously established anisotropic equations of state and by imposing the marginal firehose condition, scaling laws are obtained for quantities along the current layers as functions of plasma parameters upstream of the reconnection region. The predicted reconnection region quantities include the magnetic field strength, plasma density, and the parallel and perpendicular electron pressures, allowing for a characterization of electron energization solely as a function of the upstream plasma conditions. This characterization is in agreement with simulations and spacecraft observations. © 2015. American Geophysical Union. All Rights Reserved.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84955213564&doi=10.1002%2f2015GL067117&partnerID=40&md5=21e81c49afad44733afcc06714eba4a5
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7910
Appears in Collections:科学计划与规划
气候变化与战略

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作者单位: Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, MD, United States

Recommended Citation:
Ohia O.,Egedal J.,Lukin V.S.,et al. Scaling laws for magnetic reconnection, set by regulation of the electron pressure anisotropy to the firehose threshold[J]. Geophysical Research Letters,2015-01-01,42(24).
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