globalchange  > 气候减缓与适应
DOI: 10.1029/2017JA024846
Scopus记录号: 2-s2.0-85050258161
论文题名:
Dayside Magnetospheric and Ionospheric Responses to a Foreshock Transient on 25 June 2008: 2. 2-D Evolution Based on Dayside Auroral Imaging
作者: Wang B.; Nishimura Y.; Hietala H.; Shen X.-C.; Shi Q.; Zhang H.; Lyons L.; Zou Y.; Angelopoulos V.; Ebihara Y.; Weatherwax A.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期:8
起始页码: 6347
结束页码: 6359
语种: 英语
英文关键词: dayside aurora ; foreshock transient ; magnetopause crossing ; magnetosheath ; solar wind-magnetosphere coupling
英文摘要: The foreshock region involves localized and transient structures such as foreshock cavities and hot flow anomalies due to solar wind-bow shock interactions, and foreshock transients have been shown to lead to magnetospheric and ionospheric responses. In this paper, the interaction between a foreshock transient and the magnetosphere-ionosphere system is investigated using dayside aurora imagers revealing structures and propagation in greater detail than previously possible. A foreshock transient was detected by Time History of Events and Macroscale Interactions during Substorms B and C during 1535–1545 UT on 25 June 2008. Time History of Events and Macroscale Interactions during Substorms A, D, and E observed magnetopause compression, cold plasma enhancement, and ultralow frequency waves in the dayside magnetosphere. The all-sky imager at South Pole observed that both diffuse and discrete aurora brightened locally soon after the appearance of this foreshock transient. The diffuse aurora brightening, which corresponded to a region a few Re size in geocentric solar magnetospheric Y in the equatorial plane, propagated duskward with an average speed of ~100 km/s. Soon after the diffuse aurora brightened, discrete aurora also brightened and extended duskward, which was consistent with the motion of the foreshock transient as it swept through the magnetosheath while impacting the magnetopause. Equivalent horizontal currents measured by magnetometers revealed a pair of field-aligned currents moving duskward consistent with motion of the discrete aurora patterns. We conclude that the high-resolution and two-dimensional observation of auroral responses by ground-based all-sky imager can help to estimate the evolution and propagation of upstream foreshock transients and their substantial impacts on the magnetosphere-ionosphere coupling system, including magnetospheric compression and currents in the ionosphere. ©2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113336
Appears in Collections:气候减缓与适应

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作者单位: Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, CA, United States; Department of Astronomy and Center for Space Sciences, Boston University, Boston, MA, United States; Department of Electrical and Computer Engineering and Center for Space Sciences, Boston University, Boston, MA, United States; Department of Earth, Planetary and Space Sciences, University of California, Los Angeles, CA, United States; Optical Astronomy and Solar-Terrestrial Environment, School of Space Science and Physics, Shandong University, Weihai, China; High Altitude Observatory, National Center for Atmospheric Research, Boulder, CO, United States; Geophysical Institute, University of Alaska Fairbanks, Fairbanks, AK, United States; Cooperative Programs for the Advancement of Earth System Science, University Corporation for Atmospheric Research, Boulder, CO, United States; Research Institute for Sustainable Humanosphere, Kyoto University, Kyoto, Japan; School of Science and Engineering, Merrimack College, North Andover, MA, United States

Recommended Citation:
Wang B.,Nishimura Y.,Hietala H.,et al. Dayside Magnetospheric and Ionospheric Responses to a Foreshock Transient on 25 June 2008: 2. 2-D Evolution Based on Dayside Auroral Imaging[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(8)
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