Modeling diurnal variations of the IAR parameters
Modeling diurnal variations of the IAR parameters
复制标题
模拟 IAR 参数的日变化
DOI：
10.1007/s40328-015-0158-9
复制
发表时间：
2016
影响因子：
1.4
通讯作者：
E. Ermakova
中科院分区：
文献类型：
--
作者：
E. Fedorov;N. Mazur;V. Pilipenko;E. Ermakova
上电离层的特征是存在电离层阿尔文谐振器（IAR）和MHD波导，它们可以捕获频率范围从几分之一Hz到几Hz的电磁波。该数值模型基于真实电离层中MHD方程的解，其参数由IRI模型重构。我们估计，分析和数值，一个关键的，波尺度相关的，霍尔电导值时，波动方程的非耦合Alfvénic模式可以用来估计IAR的光谱参数。该模型使我们能够比较的贡献到IAR Q因子的焦耳耗散在低电离层和波泄漏到磁层。前一种机制在白天占主导地位，而后一种机制在夜间占主导地位。根据所开发的IAR模型推导出的关系，IAR的地面特征可用于监测F层等离子体密度和垂直总电子含量。
Characteristic feature of the upper ionosphere is the occurrence of the ionospheric Alfvén resonator (IAR) and MHD waveguide, which can trap the electromagnetic waves in the frequency range from fractions of Hz to few Hz. The proposed numerical model is based on the solution of MHD equations in a realistic ionosphere, whose parameters are reconstructed from the IRI model. We estimated, both analytically and numerically, a critical, wave scale dependent, value of the Hall conductance when a wave equation for an uncoupled Alfvénic mode can be used to estimate the spectral parameters of the IAR. The model has enabled us to compare the contributions into the IAR Q-factor of the Joule dissipation in the lower ionosphere and a wave leakage into the magnetosphere. The first mechanism dominates during daytime, whereas the latter mechanism prevails during nighttime. The ground signatures of IAR can be used for monitoring of the F-layer plasma density and vertical total electron content on the basis of relationships derived from the developed IAR model.