Simultaneous 1.5- and 4-GHz ionospheric scintillation measurement

Details Simultaneous 1.5- and 4-GHz ionospheric scintillation measurement Simultaneous 1.5- and 4-GHz ionospheric scintillation measurement

Dec 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976rasc...11.1029t&link_type=abstract

Radio Science, vol. 11, Dec. 1976, p. 1029-1036. Research sponsored by the International Telecommunications Satellite Organizati

Physics

2

Ionospheric Propagation, Microwave Transmission, Satellite Transmission, Scintillation, Amplitude Distribution Analysis, Cross Correlation, Data Acquisition, Data Reduction, Power Spectra, Radio Spectra

Scientific paper

Gigahertz ionospheric scintillation is an early nighttime phenomenon and occurs near the time of equinoxes in regions near the geomagnetic equator. One powerful method of studying this phenomenon is simultaneous measurement of radio waves at different frequencies following the same propagation path. Results are presented for an experiment designed to investigate the correlation between 1.5- and 4-GHz ionospheric scintillation. Both waves were transmitted by the ATS 5 satellite located in geostationary orbit at roughly 105 deg W longitude, and the receiving site was Tangua, Brazil (22 deg S, 42 deg W), at a geomagnetic latitude of 12 deg S. It is shown that the frequency dependence factor of the scintillation indices between 1.5 and 4 GHz decreases as the 4-GHz scintillation index increases. The cross-correlation function is about 0.3 and sometimes shows a time delay of about 3-5 sec. From the frequency dependence and the power spectra it appears that when scintillation is observed at 4 GHz, strong or multiple scattering may have already taken place at 1.5 GHz so that the weak scattering theory can no longer accurately predict the frequency dependence of the scintillation indices.

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