Ionospheric tomography based on GNSS observations of the CMONOC: performance in the topside ionosphere
Ionospheric tomography based on GNSS observations of the CMONOC: performance in the topside ionosphere
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基于 CMONOC GNSS 观测的电离层层析成像：顶部电离层的性能
DOI：
10.1007/s10291-016-0526-0
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发表时间：
2016
期刊：
影响因子：
4.9
通讯作者：
Chen Guangming
中科院分区：
文献类型：
--
作者：
Yang Zhe;Song Shuli;Chen Guangming
利用2011年10月中国地壳运动观测网络260个全球导航卫星系统（GNSS）台站的观测数据，对电离层顶面电离层层析成像的性能进行了定量分析。该层析重建具有纬度2°、经度2°和高度20 km的分辨率，具有超过70%的GPS射线路径穿过的体素，并且能够提供可靠的电离层剖面底部。与美国国防气象卫星计划（DMSP）F16、F17和F18卫星在830-880 km高度的观测结果比较，结果表明DMSP卫星在830-880 km高度的等离子体密度重建存在高估现象，白天的重建效果好于夜间。此外，夜间的重建也表明了太阳活动和纬度的依赖性。总之，就DMSP测量而言，白天偏差平均为-0.32 × 105/cm 3至-0.28 × 105/cm 3，夜间偏差为-0.37 × 105/cm 3至-0.24 × 105/cm 3，白天和夜间的标准差分别为，0.082 × 105/cm 3 ~ 0.244 × 105/cm 3和0.086 × 105/cm 3 ~ 0.428 × 105/cm 3。这项研究表明，电离层探测仪或全球导航卫星系统掩星卫星等其他来源提供的电离层垂直剖面图应纳入地基全球导航卫星系统顶部层析成像研究。
This study carries out a quantitative analysis of the performance of ionospheric tomography in the topside ionosphere, utilizing data of October 2011 collected from 260 Global Navigation Satellite System (GNSS) stations in the Crustal Movement Observation Network of China. This tomographic reconstruction with a resolution of 2° in latitude, 2° in longitude and 20 km in altitude has more than 70 % of voxels traversed by GPS raypaths and is able to provide reliable bottom parts of ionospheric profiles. Compared with the observations measured by the Defense Meteorological Satellite Program (DMSP) satellites (F16, F17 and F18) at an altitude of 830–880 km, the results show that there is an overestimation in the reconstructed plasma density at the DMSP altitude, and the reconstruction is better during daytime than nighttime. In addition, the reconstruction at nighttime also indicates a solar activity and latitudinal dependence. In summary, with respect to DMSP measurements, the daytime bias is on average from −0.32 × 105/cm3to −0.28 × 105/cm3, while the nighttime bias is between −0.37 × 105/cm3and −0.24 × 105/cm3, and the standard deviation at daytime and at nighttime is, respectively, 0.082 × 105/cm3to 0.244 × 105/cm3and 0.086 × 105/cm3to 0.428 × 105/cm3. This study suggests that vertical ionospheric profiles from other sources, such as ionosondes or GNSS occultation satellites, should be incorporated into ground-based GNSS topside tomographic studies.