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. In this work we analyze the ionograms obtained by therecent digisonde installed in Santa Maria (29.7 ∘  S,53.7 ∘  W, dip angle  =  − 37 ∘ ), Brazil, tocalculate the monthly averages of the F2 layer critical frequency(foF2), its peak height (hmF2), and the E-region criticalfrequency (foE) acquired during geomagnetically quiet days from September 2017 to August 2018. The monthly averages are compared to the 2016 versionof the International Reference Ionosphere (IRI) model predictions in orderto study its performance close to the center of the South America MagneticAnomaly (SAMA), which is a region particularly important for high-frequency(HF) ground-to-satellite navigation signals. The foF2 estimated withthe Consultative Committee International Radio (CCIR) and InternationalUnion of Radio Science (URSI) options makes good predictions throughout the year, whereas, for hmF2, it is recommended to use the SHU-2015 optioninstead of the other available options (AMTB2013 and BSE-1979). The IRI-2016model outputs for foE and the observations presented very goodagreement.

annales geophysicae

Performance of the IRI-2016 over Santa Maria, a Brazilian low-latitude station located in the central region of the South American Magnetic Anomaly (SAMA)