Abstract
The semi-thickness of the F2-layer deduced from a parabolic fit to the nose of the electron density distribution with height based on h'ƒ trace at Kokubunji, Japan, was statistically analyzed. The results showed a very conspicuous solar cyclic variation which is very like the hysteresis variation in the magnetization of the ferromagnetic substances. The same phenomena were also found in the variation of the percentage occurrence of the F1-layer and the total electron contents of the F2-layer. In this paper, these unusual variations are explained, and the conclusions thus reached are given.
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