From the statistical result of sporadic E propagation carried out on the frequency of 50 Mc/s, there is, in general, a fairly good correlation between the received field intensity and the critical frequency of the sporadic E layer measured at apex. This relation, however, is not always vahd for each case; i.e., the transmission loss of the received signal depends not only on the value of f0Es;, but also on the layer thickness and the distribution of electron density within the layer. The distribution of electron density in the sporadic E layer is deduced from both data of transmisssion loss and critical frequency at apex, if the sporadic E layer is assumed to be an extremely thm ionized layer.
THE NATIONAL BUREAU OF STANDARDS scope of activities of the National Bureau of Standards at its major laboratories in Washington, D.C., and Boulder, Colo., is suggested in the following listing of the divisions and sections engaged in technical work. In general, each section carries out specialized research, development, and engineering in the field indicated by its title.A brief description of the activities, and of the resultant publications, appears on the inside of the front cover.
The statistical study of the field intensity of VHF wave over a distance of 125km was done by using mainly the observed data of 150Mc wave and partly those of 65Mc wave. For this purpose, the weather maps, the aerological data obtained at Tateno Aerological Observatory and the meteorological elements observed at Kokubunji and Hiraiso were fully investigated.The field intensity and the range of its diurnal variation are large in summer and spring, and small in winter and on the day of precipitation. The abnormally high field intensity which appears frequently and its severe variation are considered to be reduced to the complicated distributions of the meteoroloical elements in the lower atmosphere.The effect of front is recongnized and it seems to be more remarkable in the night than in daytime.
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