| DOI: | 10.1002/2014GL060755
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| 论文题名: | Study of a global auroral Pc5 pulsation event with concurrent ULF waves |
| 作者: | Liou K.; Sibeck D.G.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9728
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| EISSN: | 1944-9459
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| 出版年: | 2014
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| 卷: | 41, 期:19 | | 起始页码: | 6547
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| 结束页码: | 6555
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| 语种: | 英语
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| 英文关键词: | auroral pulsations
; Geotail
; Pc5 ULF waves
; Polar UVI
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| Scopus关键词: | Magnetic fields
; Magnetosphere
; Plasma density
; Plasma sheaths
; Auroral pulsations
; Compressional waves
; Defense Meteorological Satellite Programs
; Geotail
; Interplanetary magnetic fields
; Magnetospheric plasmas
; Polar UVI
; ULF waves
; Magnetoplasma
; aurora
; correlation
; electromagnetic wave
; luminescence
; magnetosphere
; plasma
; wave propagation
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| 英文摘要: | We present results from a study of concurrent, periodic variations in auroral luminosity (auroral pulsations) and in magnetospheric plasma/magnetic field data. This event occurred on 10 March 2010 from ~13 to 17 UT during an extended southward interplanetary magnetic field and was probably triggered by a slow shock. The auroral pulsations, as measured by the Ultraviolet Imager on board the Polar satellite, were long lasting (~2.5 h), monochromatic (~2.5 mHz), large scale, and appeared in the night sector auroral zone with a latitudinal extent comparable to the latitudinal width of the oval. There was no phase shift between the auroral pulsations observed at different local times, indicating a stationary structure. Particle data from the Defense Meteorological Satellite Program Special Sensor Precipitating Electron and Ion Spectrometer indicate that the pulsations were diffuse originating from the central plasma sheet. During this time, Geotail was in the dawn sector plasma sheet and observed a ULF wave with the same frequency as the auroral pulsations last ~35 min. The ULF wave had large radial and compressional components, and the plasma density and total magnetic field were anticorrelated. These two observations strongly suggest that the observed ULF wave was associated with an standing ULF poloidal mode. The wave compressional component may be able to change the loss cone, resulting in periodic auroral precipitating. Key Points Use global auroral images to measure ULF wavesProvide evidence for global cavity mode in the magnetosphereIdentify compressional waves to be the candidate for the auroral Pc5 pulsations ©2014. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84911192212&doi=10.1002%2f2014GL060755&partnerID=40&md5=b79420754e55f92e1c04cd70f8f1cb54
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/6992
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Johns Hopkins University Applied Physics Laboratory, Laurel, MD, United States
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| Recommended Citation: | |
Liou K.,Sibeck D.G.. Study of a global auroral Pc5 pulsation event with concurrent ULF waves[J]. Geophysical Research Letters,2014-01-01,41(19).
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