Mathematics – Probability
Scientific paper
Jan 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976natur.259..294b&link_type=abstract
Nature, vol. 259, Jan. 29, 1976, p. 294-296.
Mathematics
Probability
1
Ionospheric Propagation, Microwave Attenuation, Midlatitude Atmosphere, Scintillation, Signal Fading, Annual Variations, Diurnal Variations, Geomagnetism, Probability Theory, Satellite Transmission, Signal Analysis
Scientific paper
Results are reported for analysis of measurements of the amplitude of microwave signals (1550 MHz) from the ATS-5 geostationary satellite. The data were analyzed for diurnal, geomagnetic, and seasonal variations, as well as for any dependence on the boundary of the high-latitude scintillation region in the direction of the equator. The method of analysis is summarized, and plots are presented which show fading in the three receiver channels used, the three-hour scintillation index relative to the geomagnetic index, and diurnal variations of the microwave scintillation index. These conclusions are made: (1) ionospheric scintillation at microwave frequencies occurs at midlatitudes, (2) 10.2% of the 250 hr of observations analyzed were undisturbed, (3) the largest peak-to-peak fluctuation was 3 dB, (4) midlatitude ionospheric scintillation is related to geomagnetic activity, (5) such scintillation has some diurnal variations, and (6) some seasonal variation is indicated.
Brown E. III W.
Haroules G. G.
Thompson William I. III
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