Night effect

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Alternative term: Night error

A polarization error caused by variations in polarization generally exhibited during the morning and evening twilight at certain frequencies, resulting from the ionosphere.

Note: This term is normally deprecated and is superseded by "Polarization error" (4-2-325).

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM