Hemispherical Shifted Symmetry in Polar Cap Patch Occurrence: A Survey of GPS TEC Maps From 2015–2018
Hemispherical Shifted Symmetry in Polar Cap Patch Occurrence: A Survey of GPS TEC Maps From 2015–2018
复制标题
极冠斑块发生中的半球对称性偏移：2015-2018 年 GPS TEC 地图调查
DOI：
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发表时间：
2019
影响因子：
5.2
通讯作者：
A. Coster
中科院分区：
文献类型：
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作者：
M. David;J. Sojka;R. Schunk;A. Coster
大量的理论和观测工作致力于研究北方半球F区极冠斑块的发生，而对南半球的研究则少得多。近年来，牧歌总电子含量（TEC）映射数据库在南半球的覆盖范围有所改善，我们现在可以进行斑块频率和发生率的研究。我们发现南半球斑块的出现与北方半球非常相似，有半年的偏移，加上大约12小时的世界时偏移。运行两个半球的电离层模型并应用相同的斑块背景技术进一步支持了这一点。此外，我们提出了一个简单的物理机制，涉及阳光照射的昼侧等离子体源与黑暗的极地帽，这产生了一个补丁到背景模式非常像在TEC映射中看到的两个半球。
Much theoretical and observational work has been devoted to studying the occurrence of F region polar cap patches in the Northern Hemisphere; considerably less work has been applied to the Southern Hemisphere. In recent years, the Madrigal database of mappings of total electron content (TEC) has improved in Southern Hemisphere coverage, to the point that we can now carry out a study of patch frequency and occurrence. We find that Southern Hemisphere patch occurrence is very similar to that of the Northern Hemisphere with a half‐year offset, plus an offset in universal time of approximately 12 hr. This is further supported by running an ionospheric model for both hemispheres and applying the same patch‐to‐background technique. Further, we present a simple physical mechanism involving a sunlit dayside plasma source concurrent with a dark polar cap, which yields a patch‐to‐background pattern very much like that seen in the TEC mappings for both hemispheres.