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Daytime twin-peak structures, also known as bite-out or diurnal double-maximastructures, are ionospheric phenomena in which the diurnal ionospheric trendshows two peaks (instead of the normal one) during the daytime. This studyreports on first simultaneous observations of these structures in the GlobalPositioning System and ionosonde measurements from the southern African andEuropean middle-latitude stations during a mostly quiet geomagnetic conditionperiod of 8–13 April 2012, which indicates that their occurrence andtherefore driving mechanism(s) may not be localised. It is found that thedaytime twin-peak structures generally appear later in the NorthernHemisphere with a 1–3 h latency although they propagate mostly equatorwardin both hemispheres. Proxies of meridional neutral winds were calculated fromavailable manually scaled ionosonde measurements and used to explore theirpotential as drivers of the structures. Bite-out events were linked todownward drifts of the vertical component of equivalent neutral winds causingplasma depletions. In addition, evidence of sporadic E layers at the same timeas enhancements of daytime twin-peak structures suggests that the tides hadinfluence via the meridional wind shear in generating these structuresthrough the dynamo electric field which resulted in upward<b>E</b>  ×  <b>B</b> drifts

Daytime twin-peak structures observed at southern African and European middle latitudes on 8–13 April 2012