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Note: This term is normally deprecated and is superseded by "Polarization error" (4-2-325).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