Fig. 2From: Numerical prediction of sporadic E layer occurrence using GAIADaily average foEs and daily average vertical ion convergence. Daily average foEs (blue line) and daily average vertical ion convergence (VIC) (red line) at Kokubunji in 2009 are compared at four different altitudes: a 130 km, b 120 km, c 110 km, and d 100 km. The scales on the daily average VIC are adjusted so that the values are best fitted to the foEs valuesBack to article page