Diurnal phase shift

The Diurnal phase shift ( uncommon German translation: diurnal phase shift) is in telecommunications, a phenomenon that leads to electromagnetic signals in a 24 - hour clock (Latin diurnal ) to a phase shift of electromagnetic signals. This phase shift is related to the daily changes in construction of the ionosphere. The reflective properties of the ionosphere change at night. Grossly simplified done at night the reflection at a higher elevation and is stronger. Tags the lower limit of the ionosphere is 80 km high and at night it rises to 100 km at.

Regardless of the propagation of radio waves through deep -reaching ionization of the Earth's atmosphere may be disturbed ( by solar flares, for example ).

Has practical significance for the phase shift for the long- wave broadcasting, due to its large range of space wave occurring at night. Also working with long waves Omega navigation method ( off today ) was influenced by this phase shift. As long waves and longitudinal waves because of their wide reach beyond the day - night boundary and the ionosphere during the day has a different height and reflectivity because of the sunlight, as in the night, it comes right here to be difficult to be calculated phase shift.

The biggest changes usually occur during sunrise or sunset at critical points along the propagation path of electromagnetic radiation.

In communications cables may cause due to the daily rhythm of daily temperature fluctuations in significant phase shifts that have nothing to do with the ionosphere.

• Wireless technology