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In telecommunication, diurnal phase shift is the phase shift of electromagnetic signals associated with daily changes in the ionosphere.
Note 1: The major changes usually occur during the period of time when sunrise or sunset is present at critical points along the path.
Note 2: Significant phase shifts may occur on paths wherein a reflection area of the path is subject to a large tidal range.
Note 3: In cable systems, significant phase shifts can be occasioned by diurnal temperature variance.
Source: from Federal Standard 1037C and from MIL-STD-188
