Comparison of foE and M(3000)F2 variability at Ibadan, Singapore and Slough

► Diurnal foE VR is characterised by sunrise and sunset peaks at low latitude stations. ► M(3000)F2 VR at all the stations and epochs shows no clear diurnal trend. ► Daytime M(3000)F2 VR is greater than foE VR at Ibadan by between 5% and10%. ► No latitudinal effect is observed in foE VR and M(3000)F2 VR. ► Nighttime M(3000)F2 VR is observed to be about half nighttime foF2 VR.