Advanced Model of the Low Latitude Current Systems in the Ionosphere: The Evening Anomaly and Equatorial Spread F

拟议的努力将侧重于推广和应用 一个现有的，二维的，数值模型的中期和 电离层内的低纬电流系统。 这 变网格模型是基于磁力线积分的 数量和解决方案的规模从全球下降到中等（5公里） 电场 首先，该模型将用于调查 Sq（太阳宁静）流系统的夜间扰动 这是造成电离层迅速上升的原因， 当地的太阳日落。 这将提供一个自洽的 Haerendel等人提出的理论的数值试验。 ? 1990年！在日落后的上升。 一旦数字研究的 全球规模的电场完成后，一个更精细的网格将 用来调查 晚上F区血浆内的异常情况称为 赤道扩展F（ESF）。 虽然英基的驱动机制是 众所周知（引力瑞利-泰勒不稳定性）， 启动或“播种的不稳定过程仍然不是 确立了习 最初，将省略播种，以查看是否 赤道展度F是从非线性一阶展开的 电场变化 然后从中立位置播种 波/电离层相互作用，如空间共振效应 将被审查。

The proposed effort will focus on extension and application of an existing, two-dimensional, numerical model of the mid- and low-latitide current systems within the ionosphere. This variable-grid model is based on magnetic field-line integrated quantities and solves for scales from global down to medium (5km) electric fields. First, the model will be used to investigate the evening perturbation to the Sq (solar quiet) current system which is responsible for the rapid rise of the ionosphere after local solar sunset. This will provide a self-consistent numerical test of the theory presented by Haerendel et al. ?1990! on the post-sunset rise. Once the numerical study of the global scale electric field is completed, a finer grid will be employed to investigate the explosive development of irregularities within the evening F Region plasma called Equatorial Spread F (ESF). While the driving mechanism of ESF is well understood (gravitational Rayleigh-Taylor instability), the initiation or "seeding of the instability process is still not established. Initially, seeding will be omitted to see if Equatorial Spread F develops from the nonlinear first order electric field variation. Then seeding from neutral- wave/ionosphere interactions such as spatial resonance effects will be examined.