globalchange  > 气候减缓与适应
DOI: 10.1002/2017JA024378
Scopus记录号: 2-s2.0-85041177115
论文题名:
On the Role of Ionospheric Ions in Sawtooth Events
作者: Lund E.J.; Nowrouzi N.; Kistler L.M.; Cai X.; Frey H.U.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期:1
起始页码: 665
结束页码: 684
语种: 英语
英文关键词: ion outflow ; magnetosphere-ionosphere coupling ; sawtooth events
英文摘要: Simulations have suggested that feedback of heavy ions originating in the ionosphere is an important mechanism for driving sawtooth injections. However, this feedback may only be necessary for events driven by coronal mass ejections (CMEs), whereas in events driven by streaming interaction regions (SIRs), solar wind variability may suffice to drive these injections. Here we present case studies of two sawtooth events for which in situ data are available in both the magnetotail (Cluster) and the nightside auroral region (FAST), as well as global auroral images (IMAGE). One event, on 1 October 2001, was driven by a CME; the other, on 24 October 2002, was driven by an SIR. The available data do not support the hypothesis that heavy ion feedback is necessary to drive either event. This result is consistent with simulations of the SIR-driven event but disagrees with simulation results for a different CME-driven event. We also find that in an overwhelming majority of the sawtooth injections for which Cluster tail data are available, the O+ observed in the tail comes from the cusp rather than the nightside auroral region, which further casts doubt on the hypothesis that ionospheric heavy ion feedback is the cause of sawtooth injections. ©2018. American Geophysical Union. All Rights Reserved.
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被引频次[WOS]:8   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114874
Appears in Collections:气候减缓与适应

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作者单位: Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, Durham, NH, United States; College Brook Scientific, Durham, NH, United States; Department of Physics, University of New Hampshire, Durham, NH, United States; Bradley Department of Electrical and Computer Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA, United States; Now at Langley Research Center, National Aeronautics and Space Administration, Hampton, VA, United States; Space Sciences Laboratory, University of California, Berkeley, CA, United States

Recommended Citation:
Lund E.J.,Nowrouzi N.,Kistler L.M.,et al. On the Role of Ionospheric Ions in Sawtooth Events[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(1)
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