The SAMI3/equatorial spread F (Sami3 is also a model of the ionosphere/ESF) code is used to simulate the growth of equatorial plasma bubbles in the presence of a background wind field based on measured winds. The measured winds exhibit the well-known “midnight temperature maximum” (MTM) pattern, in which an equatorward wind occurs simultaneously with a cessation in the zonal wind. The MTM is often preceded by strong equatorward winds (about 100 m/s). The circumstance where the MTM winds are symmetric across the equator is considered; here the meridional wind component in the southern hemisphere is the reverse of the northern meridional wind. The timing of the wind pattern relative to the imposition of a seed for the ESF instability is explored. We find that the simultaneous occurrence of a seed wave and a strong converging meridional wind pattern can produce post-midnight ESF. We further find that the seed wave and the sudden cessation of the zonal winds can also produce post-midnight ESF. The Magnetic mEridional NeuTrAl Thermospheric code verifies the occurrence of converging meridional wind patterns such as those simulated here, based on ionosonde data. Results suggest that regional-scale wind measurements would aid in the prediction signal-disrupting ionospheric bubbles.

中文翻译：

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午夜温度最大风对午夜后赤道传播 F 的影响

SAMI3/equatorial spread F（Sami3 也是电离层/ESF 的模型）代码用于基于测量的风模拟在存在背景风场的情况下赤道等离子体气泡的生长。测得的风表现出众所周知的“午夜最高温度”（MTM）模式，其中赤道风与纬向风停止同时发生。MTM 之前通常有强赤道风（约 100 m/s）。考虑了 MTM 风在赤道上对称的情况；这里南半球的经向风分量与北经向风相反。探索了相对于 ESF 不稳定种子强加的风模式的时间。我们发现种子波和强烈汇聚的经向风模式的同时发生可以产生午夜后的 ESF。我们进一步发现种子波和纬向风的突然停止也会产生午夜后的 ESF。Magnetic mEridional NeuTrAl Thermospheric 代码根据电离探测仪数据验证会聚子午风模式的出现，例如此处模拟的那些模式。结果表明，区域尺度的风测量将有助于预测破坏信号的电离层气泡。