The Effect of Midnight Temperature Maximum Winds on Post‐Midnight Equatorial Spread F
The Effect of Midnight Temperature Maximum Winds on Post‐Midnight Equatorial Spread F
复制标题
午夜温度最大风对午夜后赤道扩散F的影响
DOI：
10.1029/2021sw002728
复制
发表时间：
2021
期刊：
影响因子：
3.7
通讯作者：
P. Dandenault
中科院分区：
文献类型：
--
作者：
J. Krall;D. Hickey;J. Huba;P. Dandenault
SAMI3/赤道扩展F(SAMI3也是电离层/ESF的模式)程序被用来模拟在背景风场存在的情况下赤道等离子体气泡的增长。测得的风向呈现出众所周知的“午夜最高温度”(MTM)模式，即赤道方向的风与纬向风的停止同时发生。MTM之前往往有较强的赤道风(约100m/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半球的经向风分量相反。探讨了风型相对于ESF不稳定的种子施加的时间。我们发现，同时出现种子波和强辐合经向风型可以在午夜后产生ESF。我们进一步发现，种子波和纬向风的突然停止也可以产生午夜后的ESF。磁子午线中性热层代码根据电离层探空仪的数据，验证了这里模拟的那些经向风汇聚模式的发生。结果表明，区域尺度的风测量将有助于预测干扰电离层的信号气泡。
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.