摘要
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港结构有显著差异，末期闪烁谱高频段较初期要明显陡峭，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．同时还从闪烁港推测出不均匀体发展末期的漂移速度较初期略大．
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.
出处
《空间科学学报》
CAS
CSCD
北大核心
1995年第2期143-147,共5页
Chinese Journal of Space Science
关键词
电波闪烁
赤道电离层
不均匀体
Radiowave,Scintillation,Equatorial ionosphere,lrregularity
