低电离层中的行星波扰动及其垂直传播

PLANETARY-SCALE DISTURBANCES AND THEIR VERTICAL PROPAGATION IN THE LOWER IONOSPHERE

根据武昌电离层观象台接收的罗兰－ＣＬＦ无线电波的传播资料，利用小波分析方法，研究了１９８５年和１９８６年冬季的低电离层中的行星波扰动及其垂直传播．结果表明：（１）两个冬季中，在７５ｋｍ和９５ｋｍ高度上，均存在明显的行星波扰动，主要成分是５—１０天和１０—２０天周期的波动，扰动幅度随高度增长，但增长值小于理论增长值；（２）在７５ｋｍ高度上的扰动和９５ｋｍ高度上的扰动，具有十分相似的扰动形态．根据行星波的垂直传播理论和实验资料，得到它们的垂直传播速度为２．７—３．７ｋｍ／ｄ，垂直波长为４０—６０ｋｍ．

Using phase and amplitude recordings of the 100 kHz Sky wave signal received in Wuchang(30.3°N,114.2°E) during winter in 1985 and 1986,a study of planetary-scale wave disturbance and their vertical propagation is made by use of wavelet analysis.It shows that there are mainly distinct disturbances of planetary-scale wave with period from 5 to 10 days and from 10 to 20 days at different altitudes of 75 km and 95 km respectively.The perturbing amplitudes increase with height,[and their increasement are smaller than those of theoretical'estimations. In addition,there is a similar tendency for the change of disturbance of either at 75 km or at 95 km.According to the propagation theory and related experimental data,planetary-scale waves with vertical wavelengths of the order of 40 to 60 km and a velocity of about 2.7-3.7 km per day appear to travel in the vertical direction.