在T118-T119卡西尼号飞越期间土卫六的可变电离层
Titan's variable ionosphere during the T118-T119 Cassini flybys
摘要：
土卫六的电离层电子密度在T118和T119卡西尼号夜侧飞越之间观察到显着差异。这些飞越有相似的几何形状，发生在相同的土星当地时间，而土卫六暴露在类似的EUV和环境磁场条件。尽管存在这些相似性，但RPWS/LP测量的密度在两次通过之间相差5倍。这种差异是存在的，类似的，入站和出站。在T118期间，在1150公里和1200公里处存在两个不同的电子峰，这表明非常局部化的等离子体产生。在T118期间，从1200-1350公里和低于1100公里，在泰坦的电离层中观测到的电子密度最低。我们认为，一个非常低的粒子碰撞电离率结合在电离层中的动态增加可能是原因。然而，这并没有通过测量得到验证，并且测量的环境高能粒子压力实际上在T118期间比在T119期间更高。
英文摘要：
A significant difference in Titan's ionospheric electron density is observed between the T118 and T119 Cassini nightside flybys. These flybys had similar geometry, occurred at the same Saturn local time and while Titan was exposed to similar EUV and ambient magnetic field conditions. Despite these similarities, the RPWS/LP measured density differed a factor of 5 between the passes. This difference was present, and similar, both inbound and outbound. Two distinct electron peaks were present during T118, at 1150 km and 1200 km, suggesting very localised plasma production. During T118, from 1200-1350 km and below 1100 km, the lowest electron density ever observed in Titan's ionosphere are reported. We suggest that an exceptionally low rate of particle impact ionisation in combination with increased dynamics in the ionosphere could be the cause. This is, however, not verified by measurements and the measured ambient high energy particle pressure is in fact higher during T118 than during T119.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
