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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Radial variations in the Io plasma torus during the Cassini era
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Radial variations in the Io plasma torus during the Cassini era

机译：在Io等离子体环径向变化卡西尼时代

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A radial scan through the midnight sector of the Io plasma torus was made by the Cassini Ultraviolet Imaging Spectrograph on 14 January 2001, shortly after closest approach to Jupiter. From these data, Steffl et al. (2004a) derived electron temperature, plasma composition (ion mixing ratios), and electron column density as a function of radius from L = 6 to 9 as well as the total luminosity. We have advanced our homogeneous model of torus physical chemistry (Delamere and Bagenal, 2003) to include latitudinal and radial variations in a manner similar to the two-dimensional model by Schreier et al. (1998). The model variables include: (1) neutral source rate, (2) radial transport coefficient, (3) the hot electron fraction, (4) hot electron temperature, and (5) the neutral O/S ratio. The radial variation of parameters 1–4 are described by simple power laws, making a total of nine parameters. We have explored the sensitivity of the model results to variations in these parameters and compared the best fit with previous Voyager era models (Schreier et al., 1998), Galileo data (Crary et al., 1998), and Cassini observations (Steffl et al., 2004a). We find that radial variations during the Cassini era are consistent with a neutral source rate of 700–1200 kg/s, an integrated transport time from L = 6 to 9 of 100–200 days, and that the core electron temperature is largely determined by a spatially and temporally varying superthermal electron population.
机译：径向扫描的午夜部门Io等离子体环是由卡西尼紫外成像光谱仪在1月14日2001年,不久之后最接近木星。从这些数据,Steffl et al。(2004)等离子体电子温度、成分(离子混合比率),电子密度作为列半径的函数从L = 6到9以及总亮度。均匀的环面物理化学模型包括(Delamere Bagenal, 2003)纬向和径向变化的方式类似于Schreier二维模型et al。(1998)。中性的来源,(2)径向运输系数,(3)热电子分数,(4)热电子温度,(5)中性O / S比率。所描述的简单的权力法律,使总九个参数。在这些模型的结果变化参数和比较最好的符合旅行家previous era模特(大喊大叫等人.,1998),伽利略数据(Crary et al ., 1998)卡西尼号的观察(Steffl et al ., 2004)。在卡西尼发现径向变化时代是一致的一个中立的来源700 - 1200公斤/ s,一个完整的运输时间L = 100 - 200天,6 - 9和核心电子温度在很大程度上取决于不同superthermal时空上电子的数量。

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