Abstract
About 2000 electron density height profiles observed with the Arecibo (magn.dip 50°) incoherent scatter radar are used to compare the diurnal and seasonal variations of hmF2 with the IRI-90. A good agreement is seen for the median values. The midday bottomside profiles normalized to the peak density are compared with IRI-90 for each season and it is found that IRI overestimates the electron density distribution in the region 100 km below the F2 peak for equinox and summer but matches well during winter.
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