当前位置: X-MOL 学术Planet. Space Sci. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
A comprehensive study of Titan's magnetic pile-up region during the Cassini era
Planetary and Space Science ( IF 2.4 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.pss.2020.105037
Chen Chen , Sven Simon

Abstract While Saturn’s largest moon Titan is devoid of an intrinsic magnetic field, draping of the giant planet’s magnetospheric field around Titan’s ionosphere generates a pile-up region at the moon’s ramside. In this study, we analyze Cassini magnetic field data from all 126 Titan flybys to systematically characterize the extensions and magnitudes of the field enhancements at its ramside. Along each flyby trajectory, the segments where Cassini crossed the piled-up magnetic field are determined, and altitude profiles of the pile-up strength are also generated. We investigate the dependency of the extension and strength of the pile-up region on various parameters, such as the Saturn local time and the magnetospheric environment to which Titan is exposed. In this way, we generate a comprehensive picture of Titan’s ramside magnetic pile-up region during the Cassini era. Our major findings are: (1) The extensions of the observed pile-up reveal an asymmetry between the Saturn-facing and Saturn-averted sides caused by the large gyro-radii of ionospheric pick-up ions. (2) The observed pile-up radial extensions are nearly independent of Titan’s orbital position. (3) The lower boundary of the pile-up region is located at an altitude of 0.35 Titan radius, denoting the average altitude of the magnetic ionopause. (4) Considering the error bars, the altitude profiles of the pile-up strength show a stable picture, i.e., the radial profile of the field magnitude is independent of Saturn’s magnetospheric environment and local time.

中文翻译:

卡西尼时代土卫六磁堆积区综合研究

摘要 虽然土星最大的卫星土卫六没有固有磁场,但土卫六电离层周围的巨行星磁层场在土卫六的外缘产生了一个堆积区。在这项研究中,我们分析了来自所有 126 次泰坦飞越的卡西尼号磁场数据,以系统地描述其斜坡上磁场增强的扩展和幅度。沿着每条飞越轨迹,确定卡西尼号穿过堆积磁场的部分,并生成堆积强度的高度剖面。我们研究了堆积区域的延伸和强度对各种参数的依赖性,例如土星当地时间和泰坦暴露的磁层环境。这样,我们生成了卡西尼时代土卫六山体磁堆积区的全面图片。我们的主要发现是:(1)观测到的堆积的延伸揭示了由电离层拾取离子的大陀螺半径引起的面向土星和避开土星的两侧之间的不对称性。(2) 观察到的堆积径向延伸几乎与泰坦的轨道位置无关。(3) 堆积区的下边界位于0.35泰坦半径的高度,表示磁电离层顶的平均高度。(4) 考虑到误差条,堆积强度的高度剖面呈现出稳定的画面,即场强的径向剖面与土星的磁层环境和当地时间无关。(1) 观测到的堆积的延伸揭示了由电离层拾取离子的大陀螺半径引起的面向土星和避开土星的一侧之间的不对称性。(2) 观察到的堆积径向延伸几乎与泰坦的轨道位置无关。(3) 堆积区的下边界位于0.35泰坦半径的高度,表示磁电离层顶的平均高度。(4) 考虑到误差条,堆积强度的高度剖面呈现出稳定的画面,即场强的径向剖面与土星的磁层环境和当地时间无关。(1) 观测到的堆积的延伸揭示了由电离层拾取离子的大陀螺半径引起的面向土星和避开土星的一侧之间的不对称性。(2) 观察到的堆积径向延伸几乎与泰坦的轨道位置无关。(3) 堆积区的下边界位于0.35泰坦半径的高度,表示磁电离层顶的平均高度。(4) 考虑到误差条,堆积强度的高度剖面呈现出稳定的画面,即场强的径向剖面与土星的磁层环境和当地时间无关。(3) 堆积区的下边界位于0.35泰坦半径的高度,表示磁电离层顶的平均高度。(4) 考虑到误差条,堆积强度的高度剖面呈现出稳定的画面,即场强的径向剖面与土星的磁层环境和当地时间无关。(3) 堆积区的下边界位于0.35泰坦半径的高度,表示磁电离层顶的平均高度。(4) 考虑到误差条,堆积强度的高度剖面呈现出稳定的画面,即场强的径向剖面与土星的磁层环境和当地时间无关。
更新日期:2020-10-01
down
wechat
bug