论文标题
通过优化两型飞船的原位测量结果得出的磁通绳构型
A Magnetic Flux Rope Configuration Derived by Optimization of Two-Spacecraft In-situ Measurements
论文作者
论文摘要
越来越多的一个星际冠状质量射血（ICME）结构可以在太阳风中的多个航天器中传播。通常，当两个或多个航天器几乎与相对较小的纵向分离角相对时，就会发生这种情况。这提供了相同结构的多点测量，并可以更好地表征和验证这些ICMES中嵌入的结构的建模结果。我们在2019年10月13日至14日报告了此类事件，当时太阳陆地关系天文台（STA）航天器和帕克太阳能探针（PSP）在两个不同位置越过一个ICME结构，在地狱中心距离和纵向角度都有名义分离。我们首先基于分析性的三维（3D）模型对STA对位置测量值进行最佳拟合，从而产生最小降低的$χ^2 = 0.468 $。然后，我们通过将两个航天器沿着ICME结构的单独路径组合起来，进一步应用优化方法。我们发现，鉴于模型输出与PSP数据的大大改进了一致性，基于组合的两-Spacecraft数据集的优化（最小减少$χ^2 = 3.15 $）的输出会产生更加一致的结果。结果证明了具有清晰3D空间变化的磁通绳构型。
Increasingly one interplanetary coronal mass ejection (ICME) structure can propagate across more than one spacecraft in the solar wind. This usually happens when two or more spacecraft are nearly radially aligned with a relatively small longitudinal separation angle from one another. This provides multi-point measurements of the same structure and enables better characterization and validation of modeling results of the structures embedded in these ICMEs. We report such an event during October 13-14, 2019 when the Solar TErrestrial RElations Observatory Ahead (STA) spacecraft and the Parker Solar Probe (PSP) crossed one ICME structure at two different locations with nominal separations in both heliocentric distances and the longitudinal angles. We first perform an optimal fitting to the STA in-situ measurements, based on an analytic quasi-three dimensional (3D) model, yielding a minimum reduced $χ^2=0.468$. Then we further apply the optimization approach by combining the magnetic field measurements from both spacecraft along their separate paths across the ICME structure. We find that the output based on the optimization (with the minimum reduced $χ^2=3.15$) of the combined two-spacecraft dataset yields a more consistent result, given the much improved agreement of the model output with PSP data. The result demonstrates a magnetic flux rope configuration with clear 3D spatial variations.
