| DOI: | 10.1002/2015GL065477
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| 论文题名: | Asymmetries observed in Saturn's magnetopause geometry |
| 作者: | Pilkington N.M.; Achilleos N.; Arridge C.S.; Guio P.; Masters A.; Ray L.C.; Sergis N.; Thomsen M.F.; Coates A.J.; Dougherty M.K.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9146
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| EISSN: | 1944-8877
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| 出版年: | 2015
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| 卷: | 42, 期:17 | | 起始页码: | 6890
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| 结束页码: | 6898
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| 语种: | 英语
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| 英文关键词: | asymmetry
; magnetopause
; magnetosphere
; plasma
; Saturn
; season
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| Scopus关键词: | Magnetosphere
; Planets
; Plasmas
; asymmetry
; Cassini spacecraft
; Degree of asymmetry
; Magnetopause geometry
; North-south asymmetry
; Plasma conditions
; Saturn
; season
; Magnetopause
; asymmetry
; geometry
; magnetic field
; magnetopause
; magnetosphere
; plasma
; Saturn
; seasonal variation
; solar wind
; spacecraft
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| 英文摘要: | For over 10 years, the Cassini spacecraft has patrolled Saturn's magnetosphere and observed its magnetopause boundary over a wide range of prevailing solar wind and interior plasma conditions. We now have data that enable us to resolve a significant dawn-dusk asymmetry and find that the magnetosphere extends farther from the planet on the dawnside of the planet by 7 ± 1%. In addition, an opposing dawn-dusk asymmetry in the suprathermal plasma pressure adjacent to the magnetopause has been observed. This probably acts to reduce the size asymmetry and may explain the discrepancy between the degree of asymmetry found here and a similar asymmetry found by Kivelson and Jia (2014) using MHD simulations. Finally, these observations sample a wide range of season, allowing the "intrinsic" polar flattening (14 ± 1%) caused by the magnetodisc to be separated from the seasonally induced north-south asymmetry in the magnetopause shape found theoretically (5 ± 1% when the planet's magnetic dipole is tilted away from the Sun by 10-17). ©2015. The Authors. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84943303284&doi=10.1002%2f2015GL065477&partnerID=40&md5=1b61663526c0c8d1bcb31d67cc8778f1
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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/8762
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| Appears in Collections: | 科学计划与规划
气候变化与战略
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作者单位: | Atmospheric Physics Laboratory, Department of Physics and Astronomy, University College London, London, United Kingdom
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| Recommended Citation: | |
Pilkington N.M.,Achilleos N.,Arridge C.S.,et al. Asymmetries observed in Saturn's magnetopause geometry[J]. Geophysical Research Letters,2015-01-01,42(17).
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