Modeling CME encounters at Parker Solar Probe with OSPREI: Dependence on photospheric and coronal conditions
Modeling CME encounters at Parker Solar Probe with OSPREI: Dependence on photospheric and coronal conditions
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DOI：
10.1051/0004-6361/202245445
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发表时间：
2023-05-12
影响因子：
6.5
通讯作者：
Riley，Pete
中科院分区：
文献类型：
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作者：
Ledvina，Vincent E.;Palmerio，Erika;Riley，Pete
日冕物质抛射（CME）是来自太阳的等离子体喷发，穿过行星际空间并可能遇到地球。日冕物质抛射通常围绕着一条磁通绳，磁通绳的方向在很大程度上决定了日冕物质抛射的地球效应。目前的业务CME模型不模型MFR，但一些研究的，包括开放的太阳物理学快速包围信息（OSPREI）model.AimsWe报告的灵敏度OSPREI的范围内的用户选择的光球和日冕conditions.MethodsWe模拟四个单独的CME原位观测的帕克太阳探测器（PSP）。我们使用四种输入磁图（HMI Synchronic、HMI Synoptic、GONG Synoptic Zero Point Corrected和GONG ADAPT）改变输入光球条件。为了改变日冕场重建，我们采用了位场源表面（PFSS）模型，并在1.5-3.0R的范围内以0.1R的增量改变其源表面高度。结果我们发现，输入磁图和PFSS源表面往往会影响CME的演变，因为它通过太阳的日冕传播到行星际空间，因此，与PSP的现场数据相比，MFR预测的准确性更高。没有明显的最佳组合的输入magnetogram和PFSS源的表面heights.ConclusionsThe OSPREI模型是中等敏感的输入光球和日冕条件。根据日冕物质抛射的源区在太阳上的位置，在选择要使用的输入磁迹图时可能有最佳做法。
ContextCoronal mass ejections (CMEs) are eruptions of plasma from the Sun that travel through interplanetary space and may encounter Earth. CMEs often enclose a magnetic flux rope (MFR), the orientation of which largely determines the CMEs’ geoeffectiveness. Current operational CME models do not model MFRs, but a number of research ones do, including the Open Solar Physics Rapid Ensemble Information (OSPREI) model.AimsWe report the sensitivity of OSPREI to a range of user-selected photospheric and coronal conditions.MethodsWe modeled four separate CMEs observed in situ by Parker Solar Probe (PSP). We varied the input photospheric conditions using four input magnetograms (HMI Synchronic, HMI Synoptic, GONG Synoptic Zero-Point Corrected, and GONG ADAPT). To vary the coronal field reconstruction, we employed the Potential Field Source Surface (PFSS) model and varied its source-surface height in the range 1.5–3.0R⊙with 0.1R⊙increments.ResultsWe find that both the input magnetogram and PFSS source surface often affect the evolution of the CME as it propagates through the Sun’s corona into interplanetary space, and therefore the accuracy of the MFR prediction compared to in situ data at PSP. There is no obvious best combination of input magnetogram and PFSS source surface height.ConclusionsThe OSPREI model is moderately sensitive to the input photospheric and coronal conditions. Based on where the source region of the CME is located on the Sun, there may be best practices when selecting an input magnetogram to use.