UHF Scintillation Characteristics as Observed From Keflavik, Iceland. Preliminary Report.
Interim rept. Oct 76-Jul 77,
NAVAL RESEARCH LAB WASHINGTON D C
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This is a study of characteristics of low-elevation and high-latitude scintillation. Transmissions at 360 MHz from ATS-6 were received at Keflavik, Iceland, during June, September, and October and were analyzed to extract information related to the amplitude scintillation introduced by ionospheric andor tropospheric inhomogeneities. This report describes the data acquisition and processing procedures and some interim results. The overall average scintillation index S sub 4 was found to be 0.15, and the 1-99 fading range was about 3.5 dB. The scintillation was found to be more strongly controlled by magnetic than solar activity, as expected. The amplitude statistics were found to be non-Rayleigh, and the smaller scintillation levels observed in this study were roughly approximated by the Nakagami-m model. The power spectra exhibited a power-law rolloff from a corner frequency of 0.067 Hz with an index of -2 on the average. Generally 50 of the scintillation power was provided by frequencies less than 0.03 Hz, and the fade-duration and fade-interval distributions were typically exponential.
- Atmospheric Physics
- Radiofrequency Wave Propagation
- Radio Communications