We report the first results of a global ionosphere/thermosphere simulation study that self‐consistently generates large‐scale equatorial spread F (ESF) plasma bubbles in the postsunset ionosphere. The coupled model comprises the ionospheric code SAMI3 and the atmosphere/thermosphere code WACCM‐X. Two cases are modeled for different seasons and geophysical conditions: the March case (low solar activity: F10.7 = 70) and the July case (high solar activity: F10.7 = 170). We find that equatorial plasma bubbles formed and penetrated into the topside F layer for the March case but not the July case. For the March case, a series of bubbles formed in the Atlantic sector with irregularity spacings in the range 400–1,200 km, rose to over 800 km, and persisted until after midnight. These results are consistent with recent GOLD observations. Calculation of the generalized Rayleigh‐Taylor instability (GRTI) growth rate shows that the e‐folding time was shorter for the March case than the July case.

中文翻译：

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利用SAMI3 / WACCM‐X对赤道展宽F进行全局建模

我们报告了一项全球电离层/热层模拟研究的第一项结果，该研究自发地在电离后的电离层中一致地产生了大规模的赤道扩散F（ESF）等离子体气泡。耦合模型包括电离层代码SAMI3和大气/热层代码WACCM-X。针对不同季节和地球物理条件模拟了两种情况：3月情况（低太阳活动：F10.7 = 70）和7月情况（高太阳活动：F10.7 = 170）。我们发现赤道等离子气泡形成并渗透到顶面F3月的情况，而不是7月的情况。对于三月的情况，在大西洋区域形成的一系列气泡，其不规则间距在400-1,200 km范围内，上升到800 km以上，并一直持续到午夜之后。这些结果与最近的GOLD观察结果一致。广义瑞利-泰勒不稳定性（GRTI）增长率的计算表明，三月份的电子折叠时间比七月份的电子折叠时间短。