Ionospheric Boundaries Derived From Auroral Images
Ionospheric Boundaries Derived From Auroral Images
复制标题
DOI：
10.1029/2022ja030622
复制
发表时间：
2022-06
期刊：
影响因子：
--
通讯作者：
G. Chisham;A. Burrell;E. G. Thomas;Y‐J. Chen
中科院分区：
文献类型：
--
作者：
G. Chisham;A. Burrell;E. G. Thomas;Y‐J. Chen
本文提出了直接从北方半球极光椭圆的IMAGE远紫外（FUV）图像中定位极光向极和赤道方向亮度边界（PALB和EALB）的新方法。根据在不同FUV波长下测量的图像确定单独的边界。此外，提出了间接估计开闭磁场线边界（OCB）和向赤道降水边界（EPB）位置的新方法;这些新边界来自极光光度边界估计与统计纬度偏移的组合，这些偏移来自与低空航天器粒子降水边界（PPBs）的比较。随后，我们得到新的圆模型适合所有这些边界数据集，以及新的质量控制标准，这些模型适合。讨论了圆拟合对每个数据集的适用性，并根据低空原位航天器测量的对流对流边界（CRB）对OCB和PALB圆拟合进行了验证。涵盖2000年5月至2002年10月的所有新的边界数据集均可在网上免费获得。
This paper presents updated methods for locating the Poleward and Equatorward Auroral Luminosity Boundaries (PALB and EALB) directly from IMAGE Far UltraViolet (FUV) images of the Northern Hemisphere auroral oval. Separate boundaries are determined from images measured at different FUV wavelengths. In addition, new methods for indirectly estimating the Open‐Closed magnetic field line Boundary (OCB) and the Equatorward Precipitation Boundary (EPB) locations are presented; these new boundaries are derived from a combination of the auroral luminosity boundary estimates with statistical latitudinal offsets derived from comparisons with low‐altitude spacecraft Particle Precipitation Boundaries (PPBs). Subsequently, we derive new circle model fits for all these boundary data sets, as well as new quality control criteria for these model fits. The suitability of circle fits for each of the data sets is discussed, and the OCB and PALB circle fits are validated against the Convection Reversal Boundary (CRB), as measured by low‐altitude in situ spacecraft. All the new boundary data sets, covering the epoch May 2000 to October 2002, are freely available online.