磁赤道异常区电离层F区不均匀体发展过程中的闪烁谱研究

本文对我国磁赤道异常区海口站的夜间电离层不均匀体引起的闪烁进行了谱分析，并进行了理论模拟。大部分闪烁出现在午夜前后且持续时间较长。分析结果发现：这种持续时间较长的闪烁的末期和初期的闪烁谱结构有显著差异，末期闪烁谱高频段较初期要明显陆峭，即谱指数显著增大。由此推测出不均匀体发展末期费涅耳尺度以下的不均匀体首先衰减消失，这与国外某些轨道卫星就地测量结果大致相符。同时还从闪烁谱推测出不均匀体发展末期的漂

SCINTILLATION SPECTRA INVESTIGATIONS DURING THE EVOLUTION OF IRREGULARITIES IN THE EQUATORIAL F REGION

Power spectra are calculated for the amplitude scintillation of VHF signal at an equatorial station,Haikou.Theoretical simulation is also performed.A lot of set-ntillation events last for a long time.Temporal variation of amplitude scintillations arising due to the presence of irregularities in the night time equatorial F region is studied during the early and late stages of evolution of these irregularities.The higher frequency portion of the power spectra in the late stage are found to be steeper than these in the early stage.It can be attributed to the decay of irregularities with wavelength of several hundred meters in the late stage.The higher irregularity drift speed is found in the late phase.