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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Alignment of High-Latitude Ionospheric and Thermospheric Lagrangian Coherent Structures
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Alignment of High-Latitude Ionospheric and Thermospheric Lagrangian Coherent Structures

机译：对齐的高纬度地区电离层Thermospheric拉格朗日拟序结构

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摘要

The storm-time ionospheric-thermospheric (IT) state is of great interest, since the IT dynamics change dramatically as energy is input and dissipated in the upper atmosphere. Lagrangian coherent structures (LCSs), which are objective ridges in time-evolving flows that describe the tendency of neighboring fluid elements to separate, provides a unique opportunity to infer the dynamics in the IT system. In this work, we model IT flows with the Thermosphere-Ionosphere-Electrodynamics General Circulation Model and identify the LCSs. We compare the LCSs in the neutral winds and plasma drifts during quiet times versus during active times. We find that LCSs are largely aligned in the modeled IT flows, with a dawn-dusk asymmetry in their latitudinal position. During a geomagnetic storm, the thermospheric LCSs (T-LCSs) and ionospheric LCSs (I-LCSs) shift equatorward, align more closely with each other, and maintain a dawn-dusk asymmetry. The collocation of T-LCSs and I-LCSs and their analogous response to the geomagnetic storm provide evidence of energy input into the thermosphere and ionosphere simultaneously, and the ion drag is the dominant effect causing LCS alignment during a geomagnetic storm.
机译：的storm-time ionospheric-thermospheric (IT)状态是极大的兴趣,因为它动力学作为能量输入和发生巨大的变化在高层大气中消散。序结构(lcs),这是客观的山脊的事流描述倾向于邻近流体元素单独的,提供了一个独特的机会来推断它的动力系统。它流模型Thermosphere-Ionosphere-Electrodynamics一般循环模型和识别lcs。比较的lcs中性风和等离子体漂浮在平静时期与在活跃次了。它流动的建模,dawn-dusk不对称在他们的纬度位置。磁暴,thermospheric lcs(T-LCSs)和电离层lcs (I-LCSs)转变朝赤道方向,使彼此更紧密,和维护一个dawn-dusk的不对称。T-LCSs和I-LCSs及其搭配类似的反应地磁风暴提供证据的能量输入同时热大气层、电离层,离子拖动是显性效应导致LCS磁暴期间对齐。

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