Neutral wind effect in producing a storm time ionospheric additional layer in the equatorial ionization anomaly region
Neutral wind effect in producing a storm time ionospheric additional layer in the equatorial ionization anomaly region
复制标题
DOI：
10.1029/2009ja014050
复制
发表时间：
2009-09
影响因子：
--
通讯作者：
Chien-Hung Lin;A. Richmond;G. J. Bailey;Jann‐Yenq Liu;G. Lu;R. Heelis
中科院分区：
文献类型：
--
作者：
Chien-Hung Lin;A. Richmond;G. J. Bailey;Jann‐Yenq Liu;G. Lu;R. Heelis
[1] 预计在大型磁暴的傍晚时段，低纬度 F 区电离层中将出现一种新型附加层。通过使用 2003 年 10 月 29 日至 30 日主要磁暴期间运行的 NCAR 热层电离层电动力环流模型 (TIEGCM) 和谢菲尔德大学等离子体层电离层模型 (SUPIM) 的耦合，我们提出了一种新型的附加层，该附加层通过新的物理机制出现在赤道电离异常 (EIA) 处。这种机制要求风暴时经向中性风潮从高纬度地区传播到低纬度地区并进入相反的半球。通过穿透电场使电离层隆起后，风涌显着改变了 EIA 区域中的场对准等离子体速度，并与增强的赤道喷泉的向下场对准等离子体速度相互作用。增强型等离子喷泉和中性风涌的综合风暴效应导致等离子在高空汇聚，并在 EIA 波峰下方形成附加层。
[1] A new type of the additional layer is predicted to occur in the low-latitude F region ionosphere during evening hours of a major magnetic storm. By using the coupled NCAR Thermosphere Ionosphere Electrodynamic General Circulation Model (TIEGCM) and Sheffield University Plasmasphere Ionosphere Model (SUPIM) runs during the major magnetic storm of 29–30 October 2003, we present a new type of additional layer which occurs at the equatorial ionization anomaly (EIA) by a new physical mechanism. This mechanism requires that storm time meridional neutral wind surges travel from high to low latitudes and cross into the opposite hemisphere. The wind surges modify the field-aligned plasma velocities in the EIA regions significantly after uplift of the ionospheric layer by a penetration electric field and interact with the downward field-aligned plasma velocities of the enhanced equatorial fountain. The combined storm effects of the enhanced plasma fountain and the neutral wind surges result in plasma convergence in altitude and form the additional layers underneath the EIA crests.