摘要
本文分析了新乡（３５．３°Ｎ，１１３．９°Ｅ，ＥＴＳ—Ⅱ卫星３００ｋｍ对下点纬度３２．９°Ｎ）幅度闪烁资料，并综合Ｋｏｋｕｂｕｎｉｌ（３５．７°Ｎ，１３９．５°Ｅ，ＥＴＳ—Ⅱ卫星３００ｋｍ对下点纬度３３°Ｎ）、Ｋａｓｈｉｍａ（３５．９５°Ｎ，１４０．６７°Ｅ，ＥＴＳ—Ⅱ卫星３００ｋｍ对下点纬度３３．７°Ｎ）和Ｙａｍａｇｕｃｈｉ（３４．２°Ｎ，１３１．６°Ｅ，印度洋上空ＭＡＲＩＳＡＴ卫星３００ｋｍ对下点纬度３１．５°Ｎ）站结果，得到了如下东亚中纬地区电离层闪烁的特征：１．中纬区ＶＨＦ和Ｌ波段电离层闪烁基本上是夜间现象，但夏季正午可出现次极大值；２．闪烁出现率季节变化明显，无论是ＶＨＦ波段，还是Ｌ波段，其出现率均以夏季最强，秋季次之，冬季最弱；３．逐年变化显著，夏季夜间，平均闪烁出现率与年平均平滑太阳黑子数（ＡＡＳＳＮ）的负相关关系明显，其它时间二者无关；４．夜间强闪烁和秋季午夜前后的弱闪烁，其出现率随Ｋｐ指数增加而减小，其它时间，则与Ｋｐ指数变化无关；５．夏季夜间强闪烁的平均出现率可能有经度效应，即新乡站强闪烁的夏夜平均出现率高于Ｋｏｋｕｂｕｎｊｉ站。
In this paper, a summary of tile observational results in VHF and L bands from stations at Xinxiang(35. 3°N, 113. 9°E ; latitude of ETS-Ⅱ sub-ionospheric point at 300 km level being 32. 9°N). Kokubunji(35. 7°N,139. 5°E ; latitude of ETS- Ⅱ sub- ionospheric Point at 300 km level being 33. 3°N) .Kashima (35. 95°N, 140. 6°E;latitude of .ETS-Ⅱ sub- ionospheric point at 300 km level being 33. 7°N) and Yamaguchi(34. 2°N, 131. 6°E ;latitude of Indian MARISAT sub-ionospheric Point at 300 km level being 31. 5°N) shows the following features:1. Ionosphetic scintillations over all the four places are basically a nightly phenomenon, but a second maximumaround midday has also been found in summer;2. A seasonal vacation in the annual scintillation activity is quite clear. Either in VHF-or in L- band, (it isthe eightest )a maximum always occurs in summer ;3. A year- to-year variation of the scintillation activity is also obvious. Between the seasonal average of scintillation occurrence and the average annual smoothed sunspot number, a negative correlation is quite clear in summernights but not so in other times;4. As the index Kp rises, occurrence of strong scintillations around autumn midnight decreases but not so inothet times ;5. The average occurrence of strong scintillations in summer nights at Xinxiang is larger than that at Kokubunji.There may be some longitude effects for that.
出处
《电波科学学报》
EI
CSCD
1994年第2期45-51,共7页
Chinese Journal of Radio Science
关键词
电离层闪烁
观测
东亚中纬地区
Ionospheric scintillation
Scintillation occurrence
Peak-to-peak fluctuation of amplitude
Eastern Asia
Mid- latitude
