论文标题
基于观察到的冠状孔的太阳极通量再分配
Solar Polar Flux Redistribution based on Observed Coronal Holes
论文作者
论文摘要
我们探索观察到的极性冠状孔（CHS）在没有可靠质量极性磁场观测值的情况下，限制了全球太阳磁场图的极性区域内的通量分布。由空军数据同化的光球传输（Adapt）模型产生的全局磁图被修改以强迫场单极性阈值在观察到的CH边界内外。极性修饰和未修饰的地图用于驱动电晕和太阳风（SW）的Wang-Sheeley-Arge（WSA）模型。将WSA预测的CH与观测值进行了比较，并且在风和尤利西斯航天器上的SW预测也用于为新的极性修饰地图提供背景。我们发现极地通量的修改从未恶化，通常会改善CH和SW预测。我们还证实了WSA在生成冠状磁场溶液的域选择的重要性，但发现针对在Heliosphere中的一个位置进行了优化的解决方案可能会在其他位置进行预测。最后，我们研究了低纬度（即活动区域）磁场在设置极性CH的边界中的重要性，确定它们至少与极性场本身一样多。
We explore the use of observed polar coronal holes (CHs) to constrain the flux distribution within the polar regions of global solar magnetic field maps in the absence of reliable quality polar field observations. Global magnetic maps, generated by the Air Force Data Assimilative Photospheric flux Transport (ADAPT) model, are modified to enforce field unipolarity thresholds both within and outside observed CH boundaries. The polar modified and unmodified maps are used to drive Wang-Sheeley-Arge (WSA) models of the corona and solar wind (SW). The WSA predicted CHs are compared with the observations, and SW predictions at the WIND and Ulysses spacecraft are also used to provide context for the new polar modified maps. We find that modifications of the polar flux never worsen and typically improve both the CH and SW predictions. We also confirm the importance of the choice of the domain over which WSA generates the coronal magnetic field solution but find that solutions optimized for one location in the heliosphere can worsen predictions at other locations. Finally, we investigate the importance of low-latitude (i.e., active region) magnetic fields in setting the boundary of polar CHs, determining that they have at least as much impact as the polar fields themselves.
