ANALYSIS OF THE IONOSPHERIC SCINTILLATION SPECTRA
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摘要: 本文给出了斜入射和不均匀体各向异性情形下的闪烁强度时间频谱的理论表达式。得出在各向异性不均匀介质中传播的信号,其闪烁谱在低频端既有下降的,又有平坦的,具体视传播的几何条件而定,其中传播角的影响尤为显著。据此,较好地解释了在广州、武昌、新乡等地观测到的ETS～Ⅱ卫星VHF信号闪烁谱在低频端的不同特征。Abstract: Theoretical formula of scintillation intensity temporal frequency spectrum is presented under oblique incidence and anisotropic irregularity conditions.The theoretical results show that the low-frequency part of spectra are controlled by propagation geometry when irregularities are anisotropic.The propagation angle is thought to be a important factor.Finally,the theory is applied to interpret the VHP signal scintillation data received from the ETS-II at Xinxiang,Wuchang the Guangzhou and the theory correctly predicts the low frequency spectral shapes.
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Key words:
- Ionospheric scintillation /
- Irregularity /
- Scintillation spectra
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