VHF scintillations as a diagnostic tool for the study of ionospheric irregularities

Details VHF scintillations as a diagnostic tool for the study of ionospheric irregularities VHF scintillations as a diagnostic tool for the study of ionospheric irregularities

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994em%26p...65..247a&link_type=abstract

Earth, Moon, and Planets (ISSN 0167-9295), vol. 65, no. 3, p. 247-268

Physics

Ionospheric Disturbances, Phase Modulation, Power Spectra, Scintillation, Spread F, Very High Frequencies, Fleet Satellite Communication System, Ionospheric F-Scatter Propagation, Ionospheric Noise, Magnetic Storms

Scientific paper

In this paper we present the results of observations of the scintillations of radio beacon on 250.351 MHz from geostationary satellite FLEETSAT (73 deg E) recorded at Bombay on April 9-10, 1992 during night hours. The scintillation index, S(sub 4), is used to describe the strength of the scintillations. The variation of scintillation index with local time shows a maxima of 0.589 at 02:55 India Standard Time (IST). This scintillation activity is linked with the spread F-irregularities. A brief description of the scintillation theories like phase screen theory and theory for weak scintillations -- Rytov solution is given. These theories provide an integral measure of the fluctuations in terms of phase and amplitude fluctuations imposed on VHF signals while traversing through the ionosphere. Power spectrum analysis for the log-amplitude and phase departure and cross spectrum between them have also been carried out. Using spectral index p = 1, we have shown that the scale sizes for the ionospheric irregularities are greater than 1 km.

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