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. This study presents statistical quantification of the correlation betweenthe equatorial electrojet (EEJ) and the occurrence of the equatorial ionisationanomaly (EIA) over the East African sector. The data used were for quietgeomagnetic conditions (Kp  ≤  3) during the period 2011–2013. Thehorizontal components, H , of geomagnetic fields measured by magnetometerslocated at Addis Ababa, Ethiopia (dip lat.  ∼ 1 ∘  N), and Adigrat,Ethiopia (dip lat.  ∼ 6 ∘  N), were used to determine the EEJusing differential techniques. The total electron content (TEC) derived from GlobalNavigation Satellite System (GNSS) signals using 19 receivers located alongthe 30–40 ∘ longitude sector was used to determine the EIAstrengths over the region. This was done by determining the ratio of TEC overthe crest to that over the trough, denoted as the CT : TEC ratio. This techniquenecessitated characterisation of the morphology of the EIA over the region. Wefound that the trough lies slightly south of the magnetic equator(0–4 ∘  S). This slight southward shift of the EIA troughmight be due to the fact that over the East African region, the generalcentre of the EEJ is also shifted slightly south of the magnetic equator. For thefirst time over the East African sector, we determined a threshold daytimeEEJ strength of ∼  40  nT that is mostly associated with prominent EIAoccurrence during a high solar activity period. The study also revealed thatthere is a positive correlation between daytime EEJ and EIA strengths, with astrong positive correlation occurring during the period 13:00–15:00 LT. Keywords. Ionosphere (equatorial ionosphere)

annales geophysicae

Statistical analysis of the correlation between the equatorial electrojet and the occurrence of the equatorial ionisation anomaly over the East African sector