Longitudinal variation of F region electron density and thermospheric zonal wind caused by atmospheric tides
Longitudinal variation of F region electron density and thermospheric zonal wind caused by atmospheric tides
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DOI：
10.1029/2007gl030639
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发表时间：
2007-08
影响因子：
5.2
通讯作者：
H. Lühr;K. Häusler;C. Stolle
中科院分区：
文献类型：
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作者：
H. Lühr;K. Häusler;C. Stolle
利用CHAMP卫星在400公里处同时观测到的电子密度和纬向风，研究了系统的纵向变化。选择的时间段是2004年8月至9月，允许在正午前和日落后进行观测。赤道电离异常（EIA）和纬向δ风（偏离纬向平均）表现出持续和主导的4峰纵向变化。我们认为这种结构是由波数‐3非迁移日潮（DE3）引起的。环评和纬向三角洲风在相同经度处呈现极值。但是，虽然EIA和三角洲风的增强在晚上是一致的，但在早上它们是不一致的。研究了可能的耦合机制。
Simultaneous observations of the electron density and the zonal wind obtained by the CHAMP satellite at 400 km are used to study systematic longitudinal variations. The time period selected is August–September 2004 allowing observations at pre‐noon and post‐sunset hours. The equatorial ionization anomaly (EIA) and the zonal delta‐wind (deviation from zonal average) show a persistent and dominant 4‐peaked longitudinal variation. We interpret this structure as caused by the wavenumber‐3 nonmigrating diurnal tide (DE3). The EIA and the zonal delta‐wind exhibit extrema at about the same longitudes. But, while the intensifications of the EIA and the delta‐wind are in phase during the evening hours, they are out of phase in the morning. Possible coupling mechanisms are investigated.