摘要
利用武汉电离层观象台连续５年的高频多普勒记录，研究电离层中不规则结构反射回波的各种频谱特性及其变化．通常，扩展Ｆ回波总是引起扩散的多普勒诺；而Ｅｓ回波的多普勒图白天一般呈平直光滑谱，晚上变得扩散，其多普勒展宽常比未扩散时大２—３倍，达１Ｈｚ以上．多普勒图上有时会出现斜描迹多普勒谱，这种谱结构反映了Ｅｓ或扩展Ｆ中电子云团的漂移运动．
The doppler spectra of ionospheric irregularities have been analyzed by usingfive years HF doppler records at Wuhan Ionospheric Observatory. Usually, thedoppler spectra of spread F are always diffusive, while the spectra of Es showsmooth straight line daytime, and become diffusive in the night. The meandoppler spread of scattering echoes is 2 or 3 times more than that of normalechoes. Moreover, one type of slant striated doppler spectrum associated with thedrift of ionized clouds in Es or spread F is also discussed in this paper.
出处
《空间科学学报》
CAS
CSCD
北大核心
1996年第1期36-42,共7页
Chinese Journal of Space Science
基金
国家自然科学基金
