论文标题
彗星电离层的动量和压力平衡
Momentum and pressure balance of a comet ionosphere
论文作者
论文摘要
我们计算由离子组成分析仪（ICA）在彗星67p/churyumov-gerasimenko的Rosetta任务上测量的离子的动量通量和压力。整个任务的总动量通量大致保持恒定，但是不同离子种群的贡献会根据地为中心的距离而变化。根据Rosetta磁力计测量值计算的磁压与彗星离子动量通量大致相对应。当航天器进入太阳能离子腔时，太阳风通量急剧下降，而彗星动量通量的大约是离子腔外太阳能通量的十倍，表明皮卡离子的行为与该区域的太阳能离子相似。我们使用来自langmuir探针的电子密度来计算电子压力，这一点尤为重要，靠近彗星核，那里的流量从防空向向外变化。
We calculate the momentum flux and pressure of ions measured by the Ion Composition Analyzer (ICA) on the Rosetta mission at comet 67P/Churyumov-Gerasimenko. The total momentum flux stays roughly constant over the mission, but the contributions of different ion populations change depending on heliocentric distance. The magnetic pressure, calculated from Rosetta magnetometer measurements, roughly corresponds with the cometary ion momentum flux. When the spacecraft enters the solar wind ion cavity, the solar wind fluxes drop drastically, while the cometary momentum flux becomes roughly ten times the solar wind fluxes outside of the ion cavity, indicating that pickup ions behave similarly to the solar wind ions in this region. We use electron density from the Langmuir probe to calculate the electron pressure, which is particularly important close to the comet nucleus where flow changes from antisunward to radially outward.
