摘要
本文给出了1987年9月23日在与日环食带垂直方向上利用扫频后向散射法探测的主要结果:1.最高观测频率 MOF 及最大可用频率 MUF 相对食前下降了67%,返回信号中断约27分钟。2.初亏、复圆及复圆后可见扰动,而复圆后 TID 在环食带北侧沿探测方向运动的视在水平速度约428m/s。3.由于日食引起探测方向上 F_2层电子浓度存在水平梯度和复杂扰动,p-f 曲线异常,本文给出了日食前后少见的 p-f 曲线照片,并对此进行了定性解释。
This paper gives some results of sweep-frequency backscatter observation in the cross direction of central band of solar annular eclipse over China during the eclipse on Sept.23,1987. The main results are: 1.Both the maximum observation frequency MOF and maximum usable freguency MUF(p=1280km)decreased 67% as a result of the eclipse and the backscatter echo was interrupted for 27 minutes. 2.After the end of the eclipse along the sounding direction the TID with apparent horizontal velocity about 428m/s was observed. 3.Some unusual p-f curves caused by horizontal gradient of F_2-layer and disturba- nces were obtained and some extraordinary p-f photos with qualitative explanations are shown herein.
出处
《电波科学学报》
EI
CSCD
1990年第1期10-17,共8页
Chinese Journal of Radio Science
基金
国家教委科学基金和国家自然科学基金
