鹿児島で受信したデッカ位相差の昼間における変動

概要

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The Decometer readings show that Purple pattern is more unstable than the other patterns, the main reason of which has been believed to be its big phase comparison ratio. Observing the signal strength of Decca waves by a spectrum analyser, the skywaves of other chains propagated over long distance as long as are found even though in daytime. A big fluctuation of Decca reading is synchronized with the introduction of skywave, and then sometimes will be progressed to cycle jump. Red pattern varies slightly and Green varies scarecely. Since the interval of frequency in Purple is only 150Hz, its interference with the other chains would be enhanced than the case of other patterns. The interesting characteristics of the fluctuation are: i) occurrence frequency is big in winter and small in summer, ii) and is inverse proportional to the number of sun spot.
社団法人日本航海学会の論文
1986-09-25