DOI: 10.1029/2017JA025085
Scopus记录号: 2-s2.0-85052625965
论文题名: Survey of Thermal Plasma Composition in Saturn's Magnetosphere Using Time-of-Flight Data From Cassini/CAPS
作者: Felici M. ; Arridge C.S. ; Wilson R.J. ; Coates A.J. ; Thomsen M. ; Reisenfeld D.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 8 起始页码: 6494
结束页码: 6513
语种: 英语
英文摘要: The Cassini spacecraft orbited Saturn from 2004 to 2017, and in 2006 it started exploring the deep magnetotail, reaching distances of about 68 RS (where RS is the equatorial radius of Saturn). Since Cassini covered a broad area of Saturn's magnetosphere, this raises the question of what is the typical and atypical plasma composition in different regions of Saturn's environment. In this paper, we present a survey of the bulk plasma composition using time-of-flight data from the Plasma Spectrometer/Ion Mass Spectrometer instrument on Cassini, from 2004 through 2012. This is the most comprehensive study ever made of relative abundances of thermal plasma at Saturn, maximizing the use of Cassini's orbital coverage in Saturn's magnetosphere during those years, and, therefore, the sensitivity to seasonal or natural variability of the system. We studied the ratio of counts between ions with E/q≃1.19–21,300 eV/q and mass per charge equal to 2 (either H+ 2 or He++) and ionized hydrogen ([(m/q = 2)]/[H+]), and a mixture of ions (H2O+, H3O+, OH+, and O+), known as the water group (W+) and ionized hydrogen ([W+]/[H+]). We present the data as a function of position in the magnetosphere, radial distance and local time, and distance from the planet and longitude with respect to the moons Enceladus, Dione, Rhea, and Titan. We found that the plasma composition in Saturn's magnetosphere presents significant local time asymmetries and variability. ©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/113324
Appears in Collections: 气候减缓与适应
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作者单位: Center for Space Physics, Boston University, Boston, MA, United States; Lancaster University, Lancaster, United Kingdom; Laboratory for Atmospheric and Space Physics, Boulder, CO, United States; Mullard Space Science Laboratory, University College London, London, United Kingdom; Planetary Science Institute, Tucson, AZ, United States; University of Montana, Missoula, MT, United States
Recommended Citation:
Felici M.,Arridge C.S.,Wilson R.J.,et al. Survey of Thermal Plasma Composition in Saturn's Magnetosphere Using Time-of-Flight Data From Cassini/CAPS[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(8)