Galileo measurements of plasma density in the Io torus
Galileo measurements of plasma density in the Io torus
复制标题
伽利略测量木卫一环面等离子体密度
DOI：
10.1029/97gl01254
复制
发表时间：
1997
影响因子：
5.2
通讯作者：
W. Paterson
中科院分区：
文献类型：
--
作者：
F. Bagenal;F. Crary;A. Stewart;N. Schneider;D. Gurnett;W. Kurth;L. Frank;W. Paterson
将伽利略号上的等离子体波子系统仪器在 1995 年 12 月 7 日穿过环面期间进行的电子密度测量与基于航海者 1 号 1979 年 3 月测量的模型进行比较。在木卫一轨道之外，伽利略观测到的等离子体密度大约比航海者号值高两倍。穿过木卫一轨道后不久，伽利略密度剖面急剧下降，并在入境段的其余部分保持在较低值，这表明“带”区域要么不存在，要么比平常离木星更远。出站航段的峰值密度与基于 Voyager 的冷环面预测在位置 (5.1 Rj) 和震级 (950 cm−3) 上一致。在 5 Rj 内，密度急剧下降至小于 3 cm−3。
The measurements of electron density made by the Plasma Wave Subsystem instruments on Galileo during its pass through the torus on December 7th, 1995 are compared with a model based on Voyager 1 measurements made in March 1979. Outside Io's orbit, the plasma densities observed by Galileo are approximately a factor of two higher than the Voyager values. Shortly after crossing Io's orbit, the Galileo density profile dropped sharply and remained at low values for the rest of the inbound leg, suggesting that the ‘ribbon‧ region was either absent or much farther from Jupiter than usual. The peak density on the outbound leg is consistent with Voyager‐based predictions for the cold torus in both location (5.1 Rj) and magnitude (950 cm−3). Inside 5 Rj the density dropped sharply to less than 3 cm−3.