摘要
讨论了弱散射条件下行星际闪烁（ＩＰＳ）功率谱的Ｆｒｅｓｎｅｌ现象．数值计算结果表明，无行星际扰动存在时，ＩＰＳ功率谱的膝点频率仍是Ｆｒｅｓｎｅｌ频率，在日张角。ε≤３５°的范围内，Ｆｒｅｓｎｅｌ振荡现象仍然存在，极小值所在频率与太阳风电子密度为一维结构薄屏近似的解析结果相差不大．行星际扰动存在时，功率谱的膝点频率并未改变，扰动区太阳风速度决定着Ｆｒｅｓｎｅｌ振荡出现的频率．
The Fresnel structure of interplanetary scintillation(lPS)power spectrum is discussed in weak scattering.If there isn't interplanetary disturbance,numerical results show that the knee frequency of IPS poWer spectrum is equal to Fresnelfrequency and Fresnel oscillation consists of a series of small platforms for ε<35°.Interplanetary disturbances don't change knee frequency and solar wind velocity in disturbed region determines Fresnel oscillation.
出处
《空间科学学报》
CAS
CSCD
北大核心
1996年第3期172-177,共6页
Chinese Journal of Space Science
基金
国家自然科学基金
关键词
行星际闪烁
菲涅耳结构
太阳风速度
Interplanetary scintillation,Fresnel structure,Solar wind welocity
