中低纬电离层加热大尺度场向不均匀体的二维数值模拟

Two-dimensional simulation of high-frequency-induced large-scale irregularities in F region

大功率高频泵波加热电离层中,泵波反射高度区域是除了D,E层外的另一个主加热区.文中将在磁子午面内建立中低纬度地区泵波加热电离层中泵波反射高度处的二维模型,分别给出早晚两个时间模拟加热结果.根据模拟结果可知,整个泵波反射高度区域电子温度强烈上升,而泵波反射点周围电子浓度反而下降,该电子浓度空洞沿磁力线上下区域内电子浓度小幅上升,呈现出明显的场向特征.夜间模拟加热效应比早上更加明显,夜间、早上模拟平面内最大电子浓度变化率分别为-13%和-3.6%,电子温度变化率分别为88%和22%.另外在早晚的模拟加热中,电子浓度稠团和空洞随时间的变化也有明显的不同.由此可见,在高频泵波加热电离层中,加热结果随电离层初始条件的不同而明显不同.

When the high-power high frequency （HF） wave is pumped into the ionosphere, the pump wave reflection region is another main heated area. We setup a two-dimensional model of HF ionospheric heating in the magnetic meridian at lower latitude, and obtain results according to the background parameters of the morning and evening. We find that the electronic temperature around the pump wave reflection region increases intensively, and the electronic density decreases in the same area. The electronic density increases in the areas above and under the magnetic line of the electronic density hole. The ionospheric heating effect in the evening is much obvious than that in the morning, for which the maximum change rates of electronic density are - 13 % and - 3.6 % respectively, and the maximum change rates of electronic temperature are 88 % and 22 %, respectively.