Impact of the interaction between the quasi‐2 day wave and tides on the ionosphere and thermosphere

详细信息    查看全文

• 作者：Jia Yue ; Wenbin Wang ; Haibing Ruan ; Loren C. Chang ; Jiuhou Lei
• 刊名：Journal of Geophysical Research: Space Physics
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：121
• 期：4
• 页码：3555-3563
• 全文大小：1.4MB
• ISSN：2169-9402

文摘

The quasi-2 day wave (QTDW) can effectively interact with atmospheric tides in the mesosphere and lower thermosphere. We study the effect of this QTDW-tidal interaction on the ionosphere and thermosphere using the thermosphere-ionosphere-mesosphere electrodynamics general circulation model. This interaction reduces the amplitude of the migrating diurnal tide in the lower thermosphere by ~10 m/s in neutral winds and also generates sum and difference secondary waves in the lower thermosphere and E region ionosphere. As a result of the changed migrating diurnal tide and sum/difference secondary wave, vertical ion drift varies with local time at different longitudes by ~5 m/s. In addition, the changed migrating diurnal tide also modulates the thermospheric composition (O/N₂). During a QTDW event, the ionosphere F₂ region peak electron density (N_mF₂) is reduced due to the mixing effect of the QTDW dissipation; N_mF₂ also shows changes in local time variation due to the QTDW-tidal interaction. The sum and difference secondary waves can cause additional oscillations in vertical ion drift and ionospheric electron densities. The QTDW-tidal interaction is another mechanism by which the QTDW impacts the ionosphere and thermosphere, along with other mechanisms: QTDW modulation of the E region wind dynamo with a period of quasi-2 days and QTDW dissipation induced mixing in the thermosphere.