デッカ電波の山岳地伝搬速度についての一考察II : 波長に比し小さい地形の凹凸の影響

概要

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Firstly the electro-magnetic wave energy flows (Pointing vector's flows) were calculated around a circular conductor whose radius was 200 meters. Result of the calculation showed that the circular conductor scarcely gave influence to the energy flow which passed of the height of 400 meters at 85KHz. Secondly, energy flows along the flat earth of finite conductivity from 10km to 90km from the transmitting antenna, were calculated. According to the calculation result, in the almost portion of the propagation path, that is from 10km to 70km from antenna, the energy flow passed in a height range of 400〜700 meters so that combination thought with the circular conductor's case came to a conclusion. That is small mountains which are about 200 meters high give little influence to the propagation path at 85kHz.
社団法人日本航海学会の論文
1978-08-25