Correlation between the ionospheric WN4 signature and the upper atmospheric DE3 tide
Correlation between the ionospheric WN4 signature and the upper atmospheric DE3 tide
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DOI：
10.1029/2010ja015527
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发表时间：
2010-11
影响因子：
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通讯作者：
W. Wan;J. Xiong;Z. Ren;Libo Liu;Man‐Lian Zhang;F. Ding;B. Ning;B. Zhao;X. Yue
中科院分区：
文献类型：
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作者：
W. Wan;J. Xiong;Z. Ren;Libo Liu;Man‐Lian Zhang;F. Ding;B. Ning;B. Zhao;X. Yue
本文研究了波数为4的电离层纵向结构(WN4)与非迁移型潮汐模式DE3(全日东向波数为3)的高层大气潮汐的相关关系。利用喷气推进实验室制作的全球电离层地图推算低纬电离层总电子含量的纬向积分，并利用TIDI/TIMED观测数据反演大气纬向风和经向风。应用傅立叶滤波和拟合技术，分别从电离层和高层大气观测中得到WN4波和DE3潮汐分量。我们发现，观测到的WN4波和DE3纬向风分量经历了非常相似的年际变化，而DE3经向风分量的表现却截然不同。北半球夏季和秋季的WN4和DE3纬向风都很强，它们也出现在晚春，但在冬季趋于消失。它们的幅值随着太阳活动的减弱而增大，且在准两年振荡(QBO)东风位相比西风位相强。同时，DE3经向风一般只出现在冬季，似乎不随太阳活动和QBO位相变化。我们进一步研究了WN4波与DE3潮的两个风分量之间的关系。结果表明，WN4波与DE3纬向风的相关系数较大，而WN4波与DE3经向风的相关系数较小。这种不同的相关性归因于不同的DE3风分量具有不同的纬向对称性。DE3纬向风可能是纬向对称的潮汐模式，因此它可以有效地影响F区的漂移。相反，经向风主要以反对称型为主，因此对电离层漂移的影响很小。这些结果支持电离层F区纵向WN4结构起源于电离层E区高层大气非迁移性潮汐模DE3的对称模，主要是纬向风分量的观点。
The present work studies the correlation relationship between the longitudinal ionospheric structure of wave number 4 (WN4) and the upper atmospheric tide of nonmigrating tidal mode DE3 (diurnal eastward wave number 3). Global ionospheric maps produced by the Jet Propulsion Laboratory were used to deduce the latitudinal integration of total electron content in the low‐latitude ionosphere, and TIDI/TIMED observations were used to retrieve the atmospheric zonal and meridional winds. By applying Fourier filtering and fitting techniques, the WN4 wave and DE3 tidal components are derived from the ionospheric and upper atmospheric observations, respectively. We found that the observed WN4 wave and DE3 zonal wind components experience very similar annual and interannual variations, but the DE3 meridional wind component behaves in a quite different manner. Both WN4 and DE3 zonal winds are very intense during northern summer and autumn; they also appear in the later spring, but tend to vanish in winter. Their amplitudes increase as the solar activity decreases, and both are stronger in the quasi‐biennial oscillation (QBO) eastward wind phase than in the westward phase. At the same time, the DE3 meridional wind likes to occur only in winter and seems not change with solar activity and QBO phase. We further studied the correlation between the WN4 wave and the two wind components of the DE3 tide. We found that the cross‐correlation coefficient between the WN4 wave and the DE3 zonal wind is much larger, while that between the WN4 wave and the DE3 meridional wind is relatively smaller. Such different correlations are attributed to the different latitudinal symmetry of different DE3 wind components. The DE3 zonal wind is likely in latitudinally symmetric tidal mode; hence, it can efficiently affect theFregion ion drifts. In contrast, the meridional wind is mainly in antisymmetric mode and thus seldom affects the ionospheric drifts. The present results support the suggestion that the longitudinal WN4 structure in the ionosphericFregion originates from the symmetric modes, mainly the zonal wind component, of the upper atmospheric nonmigrating tidal mode DE3 in the ionosphericEregion.