| DOI: | 10.1002/grl.50989
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| 论文题名: | The multiple spots of the Ganymede auroral footprint |
| 作者: | Bonfond B.; Hess S.; Bagenal F.; Gérard J.-C.; Grodent D.; Radioti A.; Gustin J.; Clarke J.T.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-8491
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| EISSN: | 1944-8222
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| 出版年: | 2013
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| 卷: | 40, 期:19 | | 起始页码: | 4977
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| 结束页码: | 4981
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| 语种: | 英语
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| 英文关键词: | aurora
; footprint
; Ganymede
; Jupiter
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| Scopus关键词: | aurora
; Density variations
; footprint
; Ganymede
; Hubble space telescopes
; Jupiters
; Planetary ionospheres
; Separation distances
; Ionosphere
; Magnetosphere
; Plasma density
; Satellites
; Plasma sheaths
; aurora
; Ganymede
; Io
; ionosphere
; Jupiter
; magnetosphere
; plasma
; space technology
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| 英文摘要: | The interaction between the moons and the magnetosphere of giant planets sometimes gives rise to auroral signatures in the planetary ionosphere, called the satellite footprints. So far, footprints have been detected for Io, Europa, Ganymede, and Enceladus. These footprints are usually seen as single spots. However, the Io footprint, the brightest one, displays a much more complex morphology made of at least three different spots and an extended tail. Here we present Hubble Space Telescope FUV images showing evidence for a second spot in the Ganymede footprint. The spots separation distance changes as Ganymede moves latitudinally in the plasma sheet, as is seen for the Io footprint. This indicates that the processes identified at Io are universal. Moreover, for similar Ganymede System III longitudes, the distance may also vary significantly with time, indicating changes in the plasma sheet density. We identified a rapid evolution of this distance ∼8 days after the detection of a volcanic outburst at Io, suggesting that such auroral observations could be used to estimate the plasma density variations at Ganymede. Key Points The Ganymede footprint is made of at least 2 spots The interspot distance varies with the location of Ganymede in the plasma sheet The interspot distance possibly varies with the plasma sheet density ©2013. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84884940539&doi=10.1002%2fgrl.50989&partnerID=40&md5=7f4c10b4eaf1d1b2c7e256f91edfdc9c
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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/5755
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Laboratoire de Physique Atmosphérique et Planétaire, Université de Liège, Allée du 6 Août, 17-B5c, BE-4000 Liège, Belgium
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| Recommended Citation: | |
Bonfond B.,Hess S.,Bagenal F.,et al. The multiple spots of the Ganymede auroral footprint[J]. Geophysical Research Letters,2013-01-01,40(19).
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