THE FRESNEL STRUCTURE IN INTERPLANETARY SCINTILLATION POWER SPECTRUM AND SOLAR-WIND VELOCITY
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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。Abstract: 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.
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Key words:
- Interplanetary scintillation /
- Fresnel structure /
- Solar wind welocity
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