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

该项目将支持一名博士后对Haleakala日冕活动区和日冕红外成像光谱仪的日冕光谱偏振中性氦测量结果进行扩展分析和解释。这位博士后将模拟冷氦(He)对光球层1083 nm光的散射强度和偏振，以推导出在太阳边缘约一个太阳半径范围内探测到He I的局部等离子体条件。中性氦以前从未在离太阳这么近的地方被探测到。这些结果将与对日球层氦的空间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近太阳日球层等离子体的理解。这位博士后在天基日光层和陆基太阳社区都有经验。

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.