globalchange  > 气候减缓与适应
DOI: 10.1029/2017JA024954
Scopus记录号: 2-s2.0-85050316871
论文题名:
Impacts of Magnetosheath High-Speed Jets on the Magnetosphere and Ionosphere Measured by Optical Imaging and Satellite Observations
作者: Wang B.; Nishimura Y.; Hietala H.; Lyons L.; Angelopoulos V.; Plaschke F.; Ebihara Y.; Weatherwax A.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期:6
起始页码: 4879
结束页码: 4894
语种: 英语
英文关键词: dayside aurora ; high-speed jets ; magnetosheath ; solar wind-magnetosphere coupling
英文摘要: Magnetosheath high-speed jets (HSJs) are dayside upstream transient disturbances with enhanced flow velocity and dynamic pressure. They are associated with significant magnetopause perturbations, ultralow frequency waves in the dayside magnetosphere, and localized flow enhancements in the ionosphere. However, whether HSJs have corresponding dayside aurora signatures is still an open question. If auroral signatures are found, 2-D structure and evolution of HSJ effects on the magnetosphere can be imaged in a much higher precision than possible by other means. In this study, eight HSJ events are identified by the THEMIS satellites located within ±1 MLT of the center of the field-of-view of the South Pole station all-sky imager. In all of those cases, the HSJs are observed to have a nearly one-to-one relationship with individual localized discrete/diffuse auroral brightenings. The azimuthal size of HSJ-related diffuse aurora signatures is ~800 km at 230-km altitude in the ionosphere and ~3.7 Re in the magnetosphere, which is slightly larger but of the order of the cross-sectional diameter of HSJs (~1 Re). Furthermore, most of those aurora signatures have azimuthal motion, whose magnitude and direction agree with magnetosheath background flows. This study for the first time shows high-resolution, two-dimensional observations of localized structure and fast propagation of precipitation due to magnetosheath HSJs. We conclude that magnetosheath HSJs can have substantial impacts on the coupled magnetosphere-ionosphere system, causing localized magnetospheric compression and aurora brightening, in a similar manner to responses during interplanetary shocks except with a smaller scale size. ©2018. American Geophysical Union. All Rights Reserved.
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113727
Appears in Collections:气候减缓与适应

Files in This Item:

There are no files associated with this item.


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 Physics, Boston University, Boston, MA, United States; Department of Electrical and Computer Engineering and Center for Space Physics, Boston University, Boston, MA, United States; Department of Earth, Planetary and Space Sciences, University of California, Los Angeles, CA, United States; Space Research Institute, Austrian Academy of Sciences, Graz, Austria; 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. Impacts of Magnetosheath High-Speed Jets on the Magnetosphere and Ionosphere Measured by Optical Imaging and Satellite Observations[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(6)
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Wang B.]'s Articles
[Nishimura Y.]'s Articles
[Hietala H.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Wang B.]'s Articles
[Nishimura Y.]'s Articles
[Hietala H.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Wang B.]‘s Articles
[Nishimura Y.]‘s Articles
[Hietala H.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.