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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Comparison of Synoptic Maps and PFSS Solutions for The Declining Phase of Solar Cycle 24
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Comparison of Synoptic Maps and PFSS Solutions for The Declining Phase of Solar Cycle 24

机译：天气地图和pfs解决方案的比较太阳活动周期的下降阶段24

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The global distributions of photospheric magnetic field are routinely provided by synoptic maps, which often serve as fundamental observational input for coronal and heliospheric models. In this paper, we compare synoptic maps and PFSS-derived magnetic field results obtained during 2017/12/06– 2018/12/06, a period at the declining phase of solar cycle 24. We use four kinds of synoptic maps, the Helioseismic and Magnetic Imager (HMI) maps, the Air Force Data Assimilative Photospheric Flux Transport (ADAPT) maps, the Global Oscillation Network Group (GONG) maps with their zero-point uncertainty corrected (GONGz maps) or uncorrected (GONGb maps). Qualitatively similarity among the four maps are found in the low-latitude region, but the polar fields have notable differences. While the polar fields of HMI, ADAPT and GONGz maps are unipolar and relative stable in large scale, those of the GONGb maps are variable. The PFSS results of HMI, ADAPT, and GONGz compare reasonably with coronal remote observations and near-Earth in situ data, and the HMI maps perform slightly better. There is generally no significant difference among results of the 12 ADAPT ensemble maps, but exceptions are also found. The PFSS results of GONGb maps deviate from observation significantly. The deviations are attributed to the problematic polar field, and the source of the problem may be the zero-point uncertainty of the magnetograms. As GONGb maps perform well in the declining phase of solar cycle 23, results in this study highlight the importance of continuous assessment of synoptic map data quality.
机译：photospheric磁的全球分布提供的字段通常天气地图,通常作为基本的观察输入日冕和日球模型。这篇文章中,我们比较天气地图和PFSS-derived磁场结果2017/12/06 - 2018/12/06期间,在一个时期第24太阳活动周期的下降阶段。种天气地图,Helioseismic和磁成像仪(HMI)地图,空军数据同化Photospheric通量传输(适应)地图、全球振荡网络集团(锣)地图与零点不确定性校正(GONGz地图)或未修正的(GONGb地图)。四个地图中定性相似在低纬度地区,但极地领域有显著的差异。领域的人机界面、适应和GONGz地图是单极在大规模和相对稳定,这些的GONGb地图是变量。适应,并与日冕GONGz比较合理远程观察和近地原位数据,和人机界面地图表现略好。通常是没有显著差异12的结果调整合奏地图,但是也发现了异常。GONGb地图偏离观察显著。极地领域问题的来源这个问题可能是零点的不确定性磁力图。23岁的太阳活动周期的下降阶段的结果本研究强调持续的重要性天气地图数据质量的评估。

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