Comparing IRI E-region peak height (hmE) with incoherent scatter data Original Research Article

Based on earlier Ionosonde and Rocket data IRI-1996 assumes a constant hmE value of 110 km throughout. Though agreeing in the average with that value, incoherent scatter radar (I.S.R.) measurements at Arecibo show a total dispersion of about 15 km and a small diurnal variation with slightly higher values for solar zenith angles greater than 60°.