| 中纬度电离层foF2潮汐的变化特性 |
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| 引用本文： | 周惟琦, 余优, 万卫星, 刘立波. 2018. 中纬度电离层foF2潮汐的变化特性. 地球物理学报, 61(1): 30-42, doi: 10.6038/cjg2018K0586 |
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| 作者姓名： | 周惟琦 余优 万卫星 刘立波 |
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| 作者单位： | 1. 中国科学院地质与地球物理研究所中国科学院地球与行星物理重点实验室, 北京 100029; 2. 中国科学院地质与地球物理研究所北京空间环境国家野外科学观测研究站, 北京 100029; 3. 中国科学院大学地球科学学院, 北京 100049 |
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| 基金项目： | 国家自然科学基金项目（41404128，41131066，41674160，41621063）、中国博士后科学基金资助项目（2015T80130）、973项目课题（2011CB811405）、中国科学院院重点部署项目（KZZD-EW-01-2）资助. |
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| 摘 要： | 本文通过对1960年以来全球磁纬度40°N至50°N内测高仪台站的观测数据进行研究，提取了电离层F2层临界频率（foF2）的潮汐，揭示了其变化特征及可能的形成原因.研究发现，周日和半日的迁移潮汐分量（即DW1和SW2）强度最大，并且显示出明显的年变化和半年变化.周日潮汐的3波分量（即DE3）作为典型的非迁移潮汐分量，相对较弱，显示出微弱的半年变化.在冬季，DW1和SW2与太阳活动指数（F107）呈现正相关性，其相关系数分别大于0.88和0.65.相反，在夏季，DW1和SW2与太阳活动指数呈现负相关性，特别是SW2，其相关系数在6月份达到-0.72.在相对于纬向均值的归一化处理之后，上述潮汐强度和太阳活动指数之间的正/负相关性被显著增强/削弱.其中，归一化后的夏季DW1和SW2与太阳活动指数的相关系数达到-0.8.更加深入的讨论显示出上传的大气潮汐波动可能是电离层潮汐除了太阳辐射之外的重要驱动源，并且这种驱动机制在SW2中更加强烈.
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| 关 键 词： | 中纬度电离层 电离层潮汐 电离层-大气层耦合 |
| 收稿时间： | 2016-10-26 |
| 修稿时间： | 2017-02-20 |
Tidal variations of the ionospheric foF2 in mid-latitude ionosphere |
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| ZHOU WeiQi, YU You, WAN WeiXing, LIU LiBo. 2018. Tidal variations of the ionospheric foF2 in mid-latitude ionosphere. Chinese Journal of Geophysics (in Chinese), 61(1): 30-42, doi: 10.6038/cjg2018K0586 |
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| Authors: | ZHOU WeiQi YU You WAN WeiXing LIU LiBo |
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| Affiliation: | 1. Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; 2. Beijing National Observatory of Space Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; 3. Geoscience School University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | Ionospheric tidal features of the critical frequency of ionospheric F2 layer (foF2) and their possible causes are revealed based on the ionosonde observation from global stations between magnetic latitudes of 40°N and 50°N since 1960. It is found that the diurnal and semidiurnal migrating tidal components (DW1 and SW2) are the strongest and exhibit obvious annual and semiannual variations. The typical non-migrating tidal component, the diurnal tidal component with wavenumber 3 (DE3) is relatively weak and shows some semiannual variation. Both DW1 and SW2 are observed to have a positive correlation with solar activity index in winter, with the correlation coefficients mostly larger than 0.88 and 0.65 respectively. On contrast, summer DW1 and SW2 are found to show a negative correlation with solar activity index, especially SW2, in which the correlation coefficient reaches -0.72 in June. The positive/negative correlations between tidal strength and solar activity are significantly weakened/enhanced by the normalization (relative to the zonal mean values). The negative correlation coefficients reduce to -0.80 in both summer DW1 and SW2 by this method. Further discussion revealed that the upward atmospheric tides are confirmed to be the driving source of the ionospheric tides besides the solar radiation. Besides, this driven mechanism between atmospheric tides and ionospheric tides is particularly strong in ionospheric SW2. |
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| Keywords: | Ionosphere-atmosphere interactions Mid-latitude ionosphere Waves and tides |
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