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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Implication of Tidal Forcing Effects on the Zonal Variation of Solstice Equatorial Plasma Bubbles
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Implication of Tidal Forcing Effects on the Zonal Variation of Solstice Equatorial Plasma Bubbles

机译：潮汐的影响迫使对区域的影响变化至赤道等离子体泡沫

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摘要

Equatorial plasma bubbles (EPBs) are plasma depletions that can occur in the nighttime ionospheric F region, causing scintillation in satellite navigation and communications signals. Past research has shown that EPB occurrence rates are higher during the equinoxes in most longitude zones. An exception is over the central Pacific and African sectors, where EPB activity has been found to maximize during solstice. Tsunoda et al. (2015) hypothesized that the solstice maxima in these two sectors could be driven by a zonal wavenumber 2 atmospheric tide in the lower thermosphere. In this study, we utilize satellite observations to examine evidence of such a wave-2 feature preconditioning the nighttime ionosphere to favor higher EPB growth rates over these two regions. We find the postsunset total electron content (TEC) observed by FORMOSAT-3/COSMIC (Constellation Observing System for Meteorology, Ionosphere, and Climate) during boreal summer from 2007 to 2012 exhibits a wave-2 zonal distribution, consistent with elevated vertical plasma gradients favorable for EPB formation. Numerical experiments are also carried out to determine whether such an ionospheric wave-2 can be produced as a result of vertical coupling from atmospheric tides with zonal wavenumber 2 in the local time frame. We find that forcing from these tidal components produced increases in the Rayleigh-Taylor growth rate over both sectors during solar maximum and minimum, as well as wave-2 modulations on vertical ion drift, ion flux convergence, and nighttime TEC. Our results are consistent with the aforementioned hypothesis over both regions with vertical coupling effects from atmospheric tides preconditioning the nighttime ionosphere to favor higher EPB growth rates.
机译：赤道等离子体泡沫(epb)是等离子体消逝,它可以发生在夜间电离层F区,造成闪烁卫星导航和通信信号。过去的研究表明,EPB发生率在春分和秋分在大多数经度更高区。和非洲板块,EPB的活动夏至期间发现最大化。(2015)假设至最大值这两个部门可以由纬向波数2大气潮下热大气层。观察检查这种wave-2的证据夜间电离层特性预处理在这两个组件支持更高的增长率地区。内容(TEC)观察到FORMOSAT-3 /宇宙(星座气象观测系统,在北方夏季电离层和气候)从2007年到2012年展览一个wave-2带状垂直分布,符合升高等离子体梯度有利于EPB的形成。也进行了数值实验确定这样一个电离层wave-2即可由于垂直耦合生产大气潮汐与纬向波数2当地时间框架。潮汐组件产生增加瑞利泰勒增长率这两个行业在太阳能最大和最小,以及wave-2调节垂直离子漂移,离子通量收敛,夜间侦探。和上述的假说是一致的吗在这两个地区垂直耦合效应从大气潮汐预处理夜间电离层组件支持更高的增长利率。

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