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在前人工作的基础上,完善了一个中低纬电离层理论模式(TIME-IGGCAS:Theoretical Ionospheric Model of the Earth in Institute of Geology and Geophysics,Chinese Academy of Sciences).TIME-IGGCAS模式自洽的求解等离子体连续性方程、动量方程、能量方程,对地磁场采用偏心偶极近似.同时结合欧拉网格和拉格朗日网格,并考虑了等离子体的电场漂移作用.计算结果表明模式稳定可靠,能再现大部分电离层大尺度特征.基于本模式,进行了一个观测系统数据同化试验.结果表明,采用非线性最小二乘拟合的方法,把观测到的电离层临界频率和峰值高度同化到理论模式中,能够准确的估算电场漂移作用,为进一步开发同化模式,进行电离层现报和预报奠定了基础.
Based on the work of predecessors, a theoretical model of ionospheric middle and low latitude (TIME-IGGCAS: Theoretical Ionospheric Model of the Earth in Institute of Geology and Geophysics, Chinese Academy of Sciences) has been developed. The self-consistent solution of the TIME-IGGCAS model Plasma continuity equation, momentum equation, energy equation and eccentric dipole approximation to the geomagnetic field.At the same time, the Euler grid and the Lagrange grid are considered, and the electric field drift of the plasma is considered.The calculated results show that the model is stable Reliable and can reproduce the large-scale ionospheric characteristics.Based on this model, a data assimilation experiment of observing system is carried out.The results show that using the nonlinear least squares fitting method, the observed ionospheric critical frequency and peak height Assimilation to the theoretical model, can accurately estimate the role of electric field drift in order to further develop the assimilation mode, the ionospheric report and forecast laid the foundation.