Temporal and longitudinal variations of the pre‐reversal enhancement (PRE) in the equatorial F region vertical plasma drift are examined based on idealized simulations by the thermosphere‐ionosphere‐electrodynamics general circulation model performed under geomagnetically quiet (Kp = 1) and high solar‐flux (F_10.7 = 200) conditions. The model takes into account forcing by large‐scale waves from the middle and lower atmosphere, which leads to day‐to‐day variations of PRE. Simulations are performed under different wave forcing in order to separate contributions of various types of waves. It is shown that the simulated day‐to‐day variability of the PRE intensity is predominantly due to forcing by waves with periods less than 2 days, that is, tides and their modulation. Planetary‐wave forcing (periods of 2–20 days) makes contributions to periodic oscillations in the PRE intensity. Especially, the westward‐propagating quasi‐6‐day wave (Q6DW) with zonal wavenumber 1 is found to be an important source of ∼6‐day oscillations of PRE. Not only the Q6DW from below but also the Q6DW generated within the thermosphere, as well as the secondary waves due to the nonlinear interaction between the Q6DW and migrating tides, is at play. The zonal wavenumber 1 nature of the ∼6‐day oscillations could contribute to longitudinal differences in the appearance of equatorial spread F and plasma bubbles, which are strongly controlled by PRE.

中文翻译：

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行星波对赤道F区垂直等离子漂移逆转增强影响的建模

在理想的模拟基础上，通过热球-电离层-电动力学一般环流模型在地磁安静（Kp  = 1）和高太阳辐射下进行的赤道F区垂直等离子体漂移，对逆向增强（PRE）的时间和纵向变化进行了研究。通量（F _10.7 = 200）条件。该模型考虑了来自中低层大气的大规模波浪的强迫，这导致了PRE的日常变化。为了分离各种类型的波的贡献，在不同的波强迫下执行模拟。结果表明，PRE强度的模拟日常变化主要是由于周期小于2天的海浪，即潮汐及其调制所致。行星波强迫（周期为2至20天）为PRE强度的周期性振荡做出了贡献。尤其是，向西传播的准6天波（Q6DW）的纬向波数为1，是PRE约6天振荡的重要来源。不仅来自下方的Q6DW，而且还有热圈内产生的Q6DW，以及由于Q6DW和潮汐之间的非线性相互作用而产生的次波。约6天振荡的1号纬向波可能会导致赤道展宽F和等离子气泡出现纵向差异，这受到PRE的严格控制。