DOI: 10.1002/2014GL061747
论文题名: A combined model of pressure variations in Titan's plasma environment
作者: Achilleos N. ; Arridge C.S. ; Bertucci C. ; Guio P. ; Romanelli N. ; Sergis N.
刊名: Geophysical Research Letters
ISSN: 0094-9446
EISSN: 1944-9177
出版年: 2014
卷: 41, 期: 24 起始页码: 8730
结束页码: 8735
语种: 英语
英文关键词: magnetosphere
; plasma sheet
; Saturn
; Titan
Scopus关键词: Magnetosphere
; Planets
; Plasma sheaths
; Geometrical modeling
; In-situ measurement
; Oscillating current
; Plasma environments
; Plasma sheet
; Pressure variations
; Saturn
; Titan
; Magnetoplasma
; correlation
; in situ measurement
; magnetic field
; magnetosphere
; plasma
; pressure gradient
; Saturn
; Titan
英文摘要: In order to analyze varying plasma conditions upstream of Titan, we have combined a physical model of Saturn's plasma disk with a geometrical model of the oscillating current sheet. During modeled oscillation phases where Titan is farthest from the current sheet, the main sources of plasma pressure in the near-Titan space are the magnetic pressure and, for disturbed conditions, the hot plasma pressure. When Titan is at the center of the sheet, the main sources are the dynamic pressure associated with Saturn's cold, subcorotating plasma and the hot plasma pressure under disturbed conditions. Total pressure at Titan (dynamic plus thermal plus magnetic) typically increases by a factor of up to about 3 as the current sheet center is approached. The predicted incident plasma flow direction deviates from the orbital plane of Titan by ≲10°. These results suggest a correlation between the location of magnetic pressure maxima and the oscillation phase of the plasma sheet. Our model may be used to predict near-Titan conditions from "far-field" in situ measurements. Key Points Titan's plasma environment responds to global changes in hot plasma pressureTitan is exposed to highly variable upstream plasma beta and dynamic pressureIncluding hot plasma variability improves agreement between models and data ©2014. The Authors. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84921747095&doi=10.1002%2f2014GL061747&partnerID=40&md5=cd6ee04b7b6b5e7d93aaea10e8460ee4
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6710
Appears in Collections: 气候减缓与适应
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作者单位: Department of Physics and Astronomy, University College London, London, United Kingdom
Recommended Citation:
Achilleos N.,Arridge C.S.,Bertucci C.,et al. A combined model of pressure variations in Titan's plasma environment[J]. Geophysical Research Letters,2014-01-01,41(24).