On the generation and growth of equatorial backscatter plumes: 2. Structuring of the west walls of upwellings
On the generation and growth of equatorial backscatter plumes: 2. Structuring of the west walls of upwellings
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赤道后向散射羽流的产生和增长：2.上升流西壁的构造
DOI：
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发表时间：
1983
期刊：
影响因子：
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通讯作者：
R. Tsunoda
中科院分区：
文献类型：
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作者：
R. Tsunoda
在夜间赤道F层底部发展的大规模“上升”的西墙变得由风驱动的梯度漂移不稳定性结构化，这是导致钡离子云中条纹形成的相同过程。上升是由长空间波长（约400 km）的波动扰动引发的，并被碰撞瑞利-泰勒不稳定性放大（在向上移动的F层的情况下，有时还得到梯度漂移不稳定性的帮助）。西墙的结构化过程是由一个东中性风增强减少阻力在postsunset小时和速度剪切在东西散装等离子体漂移在底部F层。西壁结构以类似于初级等离子体气泡的方式演变，即，次级等离子体气泡从西壁生长。它们的特点进行了比较与初级泡沫，并在现有的理论进行了讨论。
The west wall of large-scale ‘upwellings’ that develop in the bottomside of the nighttime equatorial F layer becomes structured by the wind-driven gradient drift instability, the same process that leads to the formation of striations in barium ion clouds. Upwellings are initiated by wavelike perturbations with long spatial wavelengths (∼400-km) and are amplified by the collisional Rayleigh-Taylor instability (and sometimes assisted by the gradient drift instability in the case of an upward moving F layer). The west wall structuring process is driven by an eastward neutral wind enhanced by reduced drag during the postsunset hours and a velocity shear in east-west bulk plasma drift in the bottomside F layer. West wall structures evolve in a manner analogous to primary plasma bubbles, i.e., secondary plasma bubbles grow from the west wall. Their characteristics are compared with those of the primary bubbles and discussed in the light of existing theories.