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This paper presents the critical frequency foF2 behavior using in situ data and predicted one with IRI-2012 subroutines CCR and URSI during the solar cycles 21 and 22 under shocks conditions. Our investigations allowed us to identify the five types of profiles according to Faynot and Villa (1979) and observed important characteristics about foF2 amplitude seasonal variation during each solar cycle phase. The amplitudes of each type of profile depend on solar cycle phase and season. Lowestdoi:10.5281/zenodo.3963861 fatcat:s7lgvmxoebgnngo6y6czn2cykm