宇宙噪声的电离层闪烁与电离层不规则结构的结构参数

IONOSPHERIC SCINTILLATION OF COSMIC RADIO NOISE AND THE STRUCTURAL PARAMETERS OF IONOSPHERIC IRREGULARITIES

利用宇宙噪声是均匀的．各向同性的背景电磁辐射的假设，对电子密度涨落空间分布波数谱为负幂律函数的电离层不规则结构，用射线光学方法导出了闪烁功率谱的表示式．与射电星和轨道人造卫星信标的电离层闪烁相比，减少了因相对运动弓队的变量．用数值计算方法研究了电离层不规则结构的结构参量对功率谱的影响．与实测资料比较，发现电离层吸收事件期间且Ｒｉｏｍｅｔｅｒ记录的闪烁资料中，６０％以上相应的不规则结构有Ｌｙ＞１０３，Ｐ＞（０．２＜。＜０．５）．

Based on the assumption that the Cosmic Radio Noise is an isotropic backgrouna electromagnetic radiation, by use of the ray-optics method the expression of the scintillation power spectrum of electron density space fluctuation is obtained,which obeys the inverse power low of the ionospheric irregularities.Compared with that of Radiostar and satellite beacon scintillation.the ionospheric scintillation of cosmic radio noise reduces the number of variables,the variable introduced by relative movement no longer exist.The effect of the structure parameters Ly,ly,power spectrum is also studied using numerical simulation. As a result, it is found that more than 60% of the irregular strutures associated with the data recorded by Riometer during the period of the ionospheric absorption events have Ly>Z and 0.2<n <0.5.