Evaluation of a potential field source surface model with elliptical source surfaces via ballistic back mapping of in situ spacecraft data
Evaluation of a potential field source surface model with elliptical source surfaces via ballistic back mapping of in situ spacecraft data
复制标题
通过原位航天器数据的弹道反映射评估具有椭圆源表面的势场源表面模型
DOI：
10.1051/0004-6361/202039120
复制
发表时间：
2021
影响因子：
6.5
通讯作者：
Wimmer-Schweingruber
中科院分区：
文献类型：
--
作者：
Heidrich-Meisner;Wimmer-Schweingruber
位场源面（PFSS）模型是一个重要的工具，有助于连接太阳日冕磁场和太阳风。由于其简单性，它允许快速计算预测，并且需要很少的输入数据，尽管与更复杂的模型相比，其精度降低。到目前为止，PFSS模型几乎只针对球形外边界或“源表面”进行计算。改变这一点，椭圆形的源表面持有承诺，以增加其预测精度，而不需要将复杂的计算或额外的模型assumptions.AimsThe这项工作的主要目标是评估的优点添加另一个参数，即源表面的椭圆度，PFSS模型。此外，PFSS模型在不同时期的太阳活动周期的适用性以及源表面半径的影响进行了analysed.MethodsTo评估该模型，在原位航天器数据映射回源表面通过弹道的方法。原位磁场极性进行比较，在源表面的模型预测的磁场极性。该方法基于这样的假设，即性能更好的模型在预测和测量的磁场极性之间提供更好的一致性。我们采用的数据，从先进的成分探测器和双日地关系天文台（STEREO）为这个analysis.ResultsWe表明，PFSS模型执行稍好的扁圆椭圆形源表面拉长沿着太阳赤道平面，虽然最好的椭圆度不同的航天器和时期。此外，它表明，所提出的分析的性能下降期间的太阳活动周期的活跃时间。
ContextThe potential field source surface (PFSS) model is an important tool that helps link the solar coronal magnetic field to the solar wind. Due to its simplicity, it allows for predictions to be computed rapidly and requires little input data, though at the cost of reduced accuracy compared to more complex models. So far, PFSS models have almost exclusively been computed for a spherical outer boundary or “source surface”. Changing this to an elliptical source surface holds promise to increase its prediction accuracy without the necessity of incorporating complex computations or additional model assumptions.AimsThe main goal of this work is to evaluate the merit of adding another parameter, namely the ellipticity of the source surface, to the PFSS model. In addition, the applicability of the PFSS model during different periods of the solar activity cycle as well as the impact of the source surface radius are analyzed.MethodsTo evaluate the model, in situ spacecraft data are mapped back to the source surface via a ballistic approach. The in situ magnetic field polarity is compared to the magnetic field polarity predicted by the model at the source surface. This method is based on the assumption that better performing models provide better agreements between the prediction and the measured magnetic field polarity. We employ data from the Advanced Composition Explorer and the twin Solar Terrestrial Relations Observatory (STEREO) for this analysis.ResultsWe show that the PFSS model performs slightly better with oblate elliptical source surfaces elongated along the solar equatorial plane, although the best found ellipticity varies for different spacecraft and periods. In addition, it is demonstrated that the performance of the presented analysis degrades during the active times of the solar activity cycle.
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影响因子：
8.6
作者：
L. Berger;R. Wimmer–Schweingruber;G. Gloeckler
通讯作者：
L. Berger;R. Wimmer–Schweingruber;G. Gloeckler
影响因子：
6.5
作者：
Heidrich-Meisner;Wimmer-Schweingruber;Hauptmann
通讯作者：
Hauptmann
影响因子：
2.8
作者：
Richardson, I. G.;Cane, H. V.
通讯作者：
Cane, H. V.
MDI 迈克尔逊多普勒成像仪
DOI：
10.5270/esa-9kpubs2
发表时间：
2020
期刊：
MDI Michelson Doppler Imager
影响因子：
--
作者：
M. Schulz
通讯作者：
M. Schulz
影响因子：
1.9
作者：
M. Schulz
通讯作者：
M. Schulz