In this study, the difference in the sporadic E layer occurrence ratio between two low‐magnetic‐latitude (±5° to ±15°) regions is analyzed by using COSMIC scintillation observations covering the period from 2007.001 to 2017.365. Obvious longitudinal, seasonal, and LT dependencies of this phenomenon are found. Most features of the differences between two hemispheres could be explained by the difference in zonal vertical wind shear between the two hemispheres induced by the difference between the magnetic and geographic latitudes of the studied regions. This result also indicates that the wind shear mechanism still dominates sporadic E layer formation in low‐magnetic‐latitude regions.

中文翻译：

---

COSMIC无线电掩星数据观测到的南部和北部低磁纬度地区零星E层发生率的差异

在这项研究中，使用2007.001至2017.365期间的COSMIC闪烁观测分析了两个低磁纬度（±5°至±15°）区域之间零星E层出现率的差异。发现明显的纵向，季节性和长期依赖关系。两个半球之间差异的大多数特征可以通过研究区域的磁纬度和地理纬度之间的差异引起的两个半球之间的纬向垂直风切变来解释。该结果还表明，在低磁纬度地区，风切变机制仍主导着零星的E层形成。