| 引用本文: | 徐晓华,李娟,罗佳,等.COSMIC掩星电子密度廓线的质量检核.[J].国防科技大学学报,2018,40(5):54-59.[点击复制] |
| XU Xiaohua,LI Juan,LUO Jia,et al.Quality check of the ionospheric density profiles from COSMIC radio occultation observations[J].Journal of National University of Defense Technology,2018,40(5):54-59[点击复制] |
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| COSMIC掩星电子密度廓线的质量检核 |
| 徐晓华1,2, 李娟1, 罗佳1,3, 孙方方1 |
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(1. 武汉大学 测绘学院， 湖北 武汉 430079;2. 地球空间信息技术协同创新中心， 湖北 武汉 430079;3. 地球空间环境与大地测量教育部重点实验室， 湖北 武汉 430079)
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| 摘要: |
| 利用COSMIC掩星任务自2010年至2014年的电离层电子密度廓线，使用只考虑廓线自身特性的4种参数进行质量检核，并对廓线质量的时空分布进行分析。发现在廓线质量的空间分布上，廓线不合格率在高纬地区最高，其次是低纬地区，在中纬地区最低，这可能与电子密度分布在磁赤道附近存在赤道异常、两极地区的磁场强度最大有关。廓线质量的季节变化较明显，在南、北半球，冬、春两季的廓线不合格率均显著高于夏、秋两季。另外，廓线质量具有一定昼夜分布特性，不合格率白天明显较夜晚低，且在晨昏分界线上变化较大。合格廓线的电子密度峰值和峰值高度分布在磁赤道附近明显高于其他区域，呈现“双驼峰”现象。 |
| 关键词: COSMIC掩星 电子密度廓线 质量检核 时空分布 |
| DOI：10.11887/j.cn.201805009 |
| 投稿日期：2017-12-20 |
| 基金项目:国家自然科学基金资助项目（41774033，41774032） |
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| Quality check of the ionospheric density profiles from COSMIC radio occultation observations |
| XU Xiaohua1,2, LI Juan1, LUO Jia1,3, SUN Fangfang1 |
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(1. School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China;2. Collaborative Innovation Center for Geospatial Technology, Wuhan 430079, China;3. Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan 430079, China)
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| Abstract: |
| With the ionospheric electron density profiles derived from the COSMIC radio occultation mission during 2010 to 2014, the qualities of these profiles were checked comprehensively using four quality control parameters which consider only the profile′s own characteristics. The spatial and temporal distributions of the qualities of the profiles were analyzed accordingly. It is found that the qualities of the profiles are the highest over the high-latitude regions, followed by the low-latitude regions and the lowest over the mid-latitude regions. This may be due to the existence of the equatorial anomaly of the electron density distribution near the magnetic equator. The seasonal variation of the qualities of the profiles is distinct, which shows a significantly higher rejection ratio in winter and spring than in summer and autumn over both of the two hemispheres. In addition, the rejection ratio of the profiles is significantly lower in daytime than in nighttime, and it has great changes occurring at twilight demarcations. The peak electron densities and the corresponding peak heights derived from the qualified profiles are significantly higher over magnetic equator than over other regions, which shows a “double hump” phenomenon. |
| Keywords: COSMIC radio occultation ionospheric electron density profile quality check spatial and temporal distribution |
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