Equatorial Ionization Anomaly Discontinuity Observed by GOLD, COSMIC‐2, and Ground‐Based GPS Receivers' Network

We report a new ionosphere phenomenon: Equatorial ionization anomaly (EIA) discontinuity (EIAD), based on OI 135.6 nm radiance observations from the Global Observations of Limb and Disk (GOLD), ground-based total electron content maps in-situ ion density data Constellation Observing System for Meteorology, Ionosphere, Climate-2. The EIAD occurs when EIA crest has local minimum, at fixed UT, with in longitude region being weaker than that east west sides. In GOLD field-of-view, follows seasonal variations EIA. appears more often over Atlantic Ocean Africa South America. It southern during December solstice, northern both equinoxes. can occur under quiet disturbed times.