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建立一个改进的低纬F层时变理论模式．采用沿磁力线分布的固定网格点，利用算子分裂方法求解离子连续性和动量方程，给出O＋、N2＋、O2＋和NO＋密度随纬度、高度变化的二维分布．对太阳活动高年的春分季节东亚区赤道异常日变化进行的模拟计算，较好地再现了赤道异常的典型特征．计算结果也表明HWM90模式给出的低纬夜间风速可能偏大；东亚区垂直漂移速度可能比美洲区的要小．
Establish an improved time-varying theoretical model for low-level F-strata. By using fixed grid points distributed along the lines of magnetic force, we use the operator splitting method to solve the ion continuity and momentum equations, and give the two-dimensional distribution of the density of O +, N2 +, O2 + and NO + with latitude and altitude. The simulation of daily variation of equatorial anomalies in East Asia during the vernal equinox season with solar activity shows a good representation of the typical features of the equatorial anomalies. The calculation results also show that the nighttime wind speed at low latitudes given by the HWM90 model may be large. The vertical drift velocity in East Asia may be smaller than that in the Americas.