Ionospheric‐thermospheric UV tomography: 2. Comparison with incoherent scatter radar measurements
Ionospheric‐thermospheric UV tomography: 2. Comparison with incoherent scatter radar measurements
复制标题
电离层-热层紫外断层扫描：2. 与非相干散射雷达测量的比较
DOI：
10.1002/2015rs005873
复制
发表时间：
2017
期刊：
影响因子：
1.6
通讯作者：
K. Groves
中科院分区：
文献类型：
--
作者：
K. Dymond;A. Nicholas;S. Budzien;A. Stephan;C. Coker;M. Hei;K. Groves
特殊传感器紫外线临边成像仪 (SSULI) 仪器是在国防气象卫星计划 F16-F19 卫星上飞行的紫外线临边扫描传感器。 SSULI 覆盖 80–170 nm 波长范围，其中包含 91 和 136 nm 的发射，这些发射是由电离层的辐射重组产生的。我们使用新开发的算法对 91.1 nm 发射进行反转，该算法包括由于纯吸收和共振散射而产生的光学深度效应。我们介绍了我们方法的细节，包括如何确定最佳高度和沿线采样以及我们用于规范 SSULI 层析反演的新开发方法。最后，我们根据高级研究计划局远程跟踪和识别雷达 (ALTAIR) 非相干散射雷达测量结果验证了 SSULI 反演，并证明了测量结果之间的良好一致性。作为本研究的一部分，我们在反演中纳入了 O2、N2 和 O 的纯吸收效应，并发现当仅包括 O2 和 O 时，ALTAIR 和 SSULI 测量值之间的一致性最佳，但当包括 N2 吸收时，一致性会降低。这表明需要重新研究 N2 在 91.1 nm 波长附近的吸收截面。
The Special Sensor Ultraviolet Limb Imager (SSULI) instruments are ultraviolet limb scanning sensors that fly on the Defense Meteorological Satellite Program F16‐F19 satellites. The SSULIs cover the 80–170 nm wavelength range which contains emissions at 91 and 136 nm, which are produced by radiative recombination of the ionosphere. We invert the 91.1 nm emission tomographically using a newly developed algorithm that includes optical depth effects due to pure absorption and resonant scattering. We present the details of our approach including how the optimal altitude and along‐track sampling were determined and the newly developed approach we are using for regularizing the SSULI tomographic inversions. Finally, we conclude with validations of the SSULI inversions against Advanced Research Project Agency Long‐range Tracking and Identification Radar (ALTAIR) incoherent scatter radar measurements and demonstrate excellent agreement between the measurements. As part of this study, we include the effects of pure absorption by O2, N2, and O in the inversions and find that best agreement between the ALTAIR and SSULI measurements is obtained when only O2 and O are included, but the agreement degrades when N2 absorption is included. This suggests that the absorption cross section of N2 needs to be reinvestigated near 91.1 nm wavelengths.