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An Explanation of VLF Diurnal Phase Change Observations
Author(s) -
Kaiser A. B.
Publication year - 1969
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/rs004i001p00017
Subject(s) - daytime , mode (computer interface) , dominance (genetics) , transmitter , physics , phase (matter) , radio wave , ionosphere , very low frequency , diurnal temperature variation , atmospheric sciences , computational physics , environmental science , geophysics , telecommunications , astronomy , computer science , biochemistry , chemistry , channel (broadcasting) , quantum mechanics , gene , operating system
The observed diurnal phase changes of VLF radio waves show large deviations from the theoretical first‐mode phase change. The main features of the deviations are explained by the presence of a second mode that is larger than the first mode at night but that is small during transitions and during daytime. The data indicate that for frequencies above 16 kHz, nighttime second‐mode dominance extends out to several megameters from the transmitter, in agreement with theoretical predictions.