1995年10月24日日食电离层效应的模式化研究

MODELING STUDY OF THE IONOSPHERIC EFFECTS DURING A SOLAR ECLIPSE OF OCTOBER 24, 1995

利用一个二维低纬电离层理论模式模拟1995年10月24日日全食条件下东亚低纬电离层演变，探索低纬日食期间电离层效应．模式计算结果显示：日食期间日食区电离层电子与离子光致电离产生率减少使得E-F1区电离层光食效应显著，而较高部份电离层对日食影响的响应延迟．此次日食过程中EUV辐射通量和垂直漂移变化对低纬F区电离层电子浓度影响明显，而电子温度下降对低纬f0F2影响甚微．

This paper presents the simulated results of the ionospheric responses to a solar eclipse occurred on October 24, 1995 using a 2D low latitude ionospheric theoretical model. The variations of ion photoionization productions, E × B vertical drifts and electron temperatures induced by the eclipse are considered in the modeling calculations. Results show that during the eclipse, optical eclipse effects are quite clear at the low altitudes, while the responses are smaller, more delayed and longer lasting at the high altitudes. The effects of the depression of electron temperatures induced by the eclipse on the low latitude F layer are smaller comparing with those caused by variations of EUV fluxes and vertical drifts, which are important for the ionospheric effects of this eclipse.