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On the multiple scattering of VHF/UHF waves in the equatorial ionosphere
Author(s) -
Vats Hari Om
Publication year - 1981
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/rs016i003p00393
Subject(s) - scattering , ionosphere , amplitude , computational physics , scintillation , radio wave , physics , ultra high frequency , spectral line , incoherent scatter , forward scatter , geophysics , optics , telecommunications , astronomy , quantum mechanics , computer science , detector
Using amplitude data of radio beacons at 40, 140, and 360 MHz from ATS 6 (phase II), an attempt has been made to study scattering of these waves in the equatorial ionosphere. A comparison of observed scintillation index S 4 with the theoretical results of the multiple scattering approach and variation of autocorrelation time with the frequency indicates that this theory explains the results to a large extent. A comparison of power spectra of amplitude records with the ionograms of a nearby equatorial station has led to the following conclusions: The change from a weak scattering regime to a strong scattering regime is gradual and occurs because of the gradual decrease in the scale size of the irregularities (i.e., broadening of the spectra) and the gradual increase in the thickness of the irregular region.