摘要
本文分析了1987年9月23日日环食期间利用 LF 无线电波传播实验所得的观测记录。结果表明:日食期间 LF 天波的相位和振幅都有明显的日食效应,特别是振幅呈现周期性的衰减型振荡。同时,还根据大气的运动方程在理论上计算了日食引起的中层大气扰动。计算表明:在60公里左右,由于热效应产生一个径向速度为31米/秒并向着日食带主食区运动的空气扰动;而在70～80公里处,空气扰动却很小,几乎可以忽略。这些高度上的日食效应主要表现为电离特性的扰动,食甚时这个高度主食带的电离率只有日食前的29%。
In this paper,experimental results and theoretical investigation of the middle at- mospheric disturbance which is detected during the annular eclipse on 23 September 1987 by means of the phase and field strength variation of LF signals are presented. It is shown that:the disturbance of atmospheric motion at about 60 km height is ca- used by rapid cooling during the annular eclipse;The change of meridional wind is about 31m/s;At 70-80km height this disturbance is very week;But the ionization changes are evident at these heights,and the ionization rate during the annular ecli- pse is reduced to about 29 percent of its normal value.
出处
《电波科学学报》
EI
CSCD
1990年第1期44-48,共5页
Chinese Journal of Radio Science
