Journal of Geophysical Research: Space Physics Survey of thermal plasma ions in Saturn’s magnetosphere utilizing a forward model
Journal of Geophysical Research: Space Physics Survey of thermal plasma ions in Saturn’s magnetosphere utilizing a forward model
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地球物理研究杂志：利用正演模型对土星磁层中的热等离子体离子进行空间物理调查
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
A. Persoon
中科院分区：
文献类型：
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作者：
R. Wilson;F. Bagenal;A. Persoon
卡西尼号等离子体光谱仪收集了2004年至2012年土星的热离子数据，主要观测水族离子和质子。等离子体参数，与不确定性，这两个离子物种的推导使用各向异性对流麦克斯韦运动在一个共享的速度向前模型。由此产生的数据集过滤的各种选择标准，以产生一个调查的等离子体参数在10度内的赤道在径向距离为5.5至30 RS（1 RS =土星的半径）。之前的2008年的工作使用了一种更简单的方法，在5个轨道上只有150个记录;这次全面的调查在所有9年中有9736个记录。我们提出了本次调查的结果，并将其与以前的调查来自数值矩，突出报道的密度和温度从两种方法之间的差异。内、中磁层等离子体参数的径向廓线在23 RS以外是逐年稳定的，而在23 RS以上的磁层顶附近是变化的。新的结果包括质子密度在磁层顶附近增加，暗示等离子体混合;土星内磁层的全球电场延伸到15 RS的证据;没有超共转等离子体的证据，也没有中磁层的“等离子体凸轮”特征;热等离子体β在赤道距离大于15 RS时超过1。
The Cassini Plasma Spectrometer instrument gathered thermal ion data at Saturn from 2004 to 2012, predominantly observing water group ions and protons. Plasma parameters, with uncertainties, for those two ion species are derived using a forward model of anisotropic convected Maxwellians moving at a shared velocity. The resulting data set is filtered by various selection criteria to produce a survey of plasma parameters derived within 10∘ of the equator at radial distances of 5.5 to 30 RS (1 RS = Saturn’s radius). The previous 2008 work used a simpler method and had just 150 records over 5 orbits; this comprehensive survey has 9736 records over all 9 years. We present the results of this survey and compare them with a previous survey derived from numerical moments, highlighting the differences between the reported densities and temperatures from the two methods. Radial profiles of the plasma parameters in the inner and middle magnetospheres out to ≈22 RS are stable year by year, but variable at distances larger than 23 RS near the magnetopause. New results include proton densities increasing in the near magnetopause region, suggestive of plasma mixing; evidence for the global electric field in Saturn’s inner magnetosphere extends out to ≈15 RS; no evidence for supercorotating plasma nor the middle magnetosphere “plasma cam” feature is present; the thermal plasma β is found to exceed unity at equatorial distances greater than 15 RS.
影响因子：
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作者：
C. Arridge;K. Khurana;C. Russell;D. Southwood;N. Achilleos;M. Dougherty;A. Coates;H. Leinweber
通讯作者：
C. Arridge;K. Khurana;C. Russell;D. Southwood;N. Achilleos;M. Dougherty;A. Coates;H. Leinweber
磁盘中本地时间不对称的来源
影响因子：
10.3
作者：
Arridge C
通讯作者：
Arridge C