Title :
Characteristics of the Ionosphere at Washington, D.C., January, 1940, with Predictions for April, 1940
Author :
Gilliland, T.R. ; Kirby, S.S. ; Smith, N.
Author_Institution :
National Bureau of Standards, Washington, D.C.
fDate :
3/1/1940 12:00:00 AM
Abstract :
Data on the ordinary-wave critical frequencies and virtual heights of the ionospheric layers are presented for the period indicated in the title. The monthly average values of the maximum usable frequencies for undisturbed days, for radio transmission by way of the regular layers is also provided.
Keywords :
Electromagnetic wave absorption; Frequency; Hafnium; Ionosphere; NIST; Observatories; Radio transmitters; Reflection; Storms; US Department of Commerce;
Journal_Title :
Proceedings of the IRE
DOI :
10.1109/JRPROC.1940.229026
