SHINE Postdoc: Using Neutral Helium to Understand Coronal and Heliospheric Plasmas

该项目将支持博士后对Haleakala太阳观测站临边活动区和日冕（SOLARC）成像红外（IR）光谱仪的日冕分光偏振中性氦测量进行扩展分析和解释。博士后将模拟冷氦（He）对光球散射的1083 nm光的强度和偏振，以推导出局部等离子体条件，该条件解释了在太阳边缘约一个太阳半径范围内的区域中的He I检测。中性氦以前从未在离太阳这么近的地方被探测到。这些结果将与日光层氦的天基观测和电离氦的近源拾取离子模型相结合，以扩大我们对日冕和太阳风的复杂的近太阳日光层等离子体的理解。博士后在天基日光层和地基太阳能社区都有经验。

This project will support a postdoctoral to perform an extended analysis and interpretation of coronal spectropolarimetric neutral helium measurements from the Haleakala Solar Observatory for Limb Active Regions and Coronae (SOLARC) imaging infra-red (IR) spectrograph. The postdoctoral will model the intensity and polarization of photospheric scattered 1083nm light by cool helium (He), to derive local plasma conditions that account for the He I detection in a region within about one solar radius of the Sun's limb. Neutral helium has never before been detected this close to the Sun. These results will be combined with space-based observations of heliospheric helium, and near-source pick-up ion models for ionized helium, to expand our understanding of the complex near-Sun heliospheric plasma of the corona and solar wind. The postdoctoral has experience in both the space-based heliospheric and the ground-based solar communities.