Swedish Institute of Space Physics, Post Office Box 812, 981 28 Kiruna, Sweden. Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Rymdcampus 1, 981 28 Kiruna, Sweden.
Swedish Institute of Space Physics, Post Office Box 812, 981 28 Kiruna, Sweden.
Science. 2015 Jan 23;347(6220):aaa0571. doi: 10.1126/science.aaa0571.
The Rosetta mission shall accompany comet 67P/Churyumov-Gerasimenko from a heliocentric distance of >3.6 astronomical units through perihelion passage at 1.25 astronomical units, spanning low and maximum activity levels. Initially, the solar wind permeates the thin comet atmosphere formed from sublimation, until the size and plasma pressure of the ionized atmosphere define its boundaries: A magnetosphere is born. Using the Rosetta Plasma Consortium ion composition analyzer, we trace the evolution from the first detection of water ions to when the atmosphere begins repelling the solar wind (~3.3 astronomical units), and we report the spatial structure of this early interaction. The near-comet water population comprises accelerated ions (<800 electron volts), produced upstream of Rosetta, and lower energy locally produced ions; we estimate the fluxes of both ion species and energetic neutral atoms.
罗塞塔任务将伴随彗星 67P/楚留莫夫-格拉希门克从>3.6 个天文单位的日心距离穿过 1.25 个天文单位的近日点，跨越低和最大活动水平。最初，太阳风渗透由升华形成的稀薄彗星大气，直到电离大气的大小和等离子体压力定义了它的边界：一个磁层诞生了。利用罗塞塔等离子体联合离子成分分析仪，我们追踪了从首次探测到水分子到大气开始排斥太阳风（~3.3 个天文单位）的演化过程，并报告了这一早期相互作用的空间结构。近彗星水群体包括在罗塞塔上游产生的加速离子（<800 电子伏特）和低能本地产生的离子；我们估计了这两种离子物种和高能中性原子的通量。
