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Global structure of the lunar tide in ionospheric total electron content

机译：电离层总电子含量中的潮汐整体结构

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摘要

The global structure of the lunar tide in the ionosphere is studied based on observations of the global positioning system (GPS) total electron content (TEC). The unprecedented spatial and temporal resolution afforded by the GPS TEC observations enables illustration of the latitude, longitude, solar local time, and seasonal variability of the lunar tide in the ionosphere. Based on analysis of the multiyear mean from 1999-2008, the dominant component is generally the semidiurnal lunar tide. However, a significant diurnal variation is also observed in some instances. The semidiurnal component achieves a maximum amplitude of ～6% in the equatorial ionization anomaly crest regions and a slight hemispheric asymmetry is present with larger amplitudes in the Northern Hemisphere. Furthermore, the maximum amplitudes in the semidiurnal lunar tide are found to occur during Northern Hemisphere winter and during 9-15 solar local time. During certain years, a secondary maxima in solar local time is also observed demonstrating the influence of the lunar tide on the prereversal enhancement. Lastly, the observations reveal significant longitudinal variability in the semidiurnal lunar tide that is most prominent between November and February. The presence of a longitudinal variation reveals the existence of nonmigrating components in addition to the dominant migrating semidiurnal lunar tide.
机译：基于对全球定位系统（GPS）总电子含量（TEC）的观测，研究了电离层月球潮的整体结构。 GPS TEC观测值提供了前所未有的时空分辨率，可以说明电离层中月度的纬度，经度，太阳当地时间和季节性变化。根据对1999-2008年的多年平均值的分析，主要成分通常是半昼夜潮汐。但是，在某些情况下，也会观察到明显的昼夜变化。半日分量在赤道电离异常波峰区域达到最大幅度约6％，并且在北半球存在轻微的半球不对称性，且幅度较大。此外，发现半日潮中的最大振幅发生在北半球冬季和当地太阳9-15时。在某些年份中，还观察到了太阳当地时间的次要最大值，表明了潮汐对逆转前增强的影响。最后，观测结果显示半月潮汐的明显纵向变化，在11月至2月之间最为明显。纵向变化的存在揭示了除了主要的迁移半昼夜潮汐外，还存在非迁移成分。

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