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)
2020
Abstract. In this work we analyze the ionograms obtained by the
recent digisonde installed in Santa Maria (29.7 ∘ S,
53.7 ∘ W, dip angle = − 37 ∘ ), Brazil, to
calculate the monthly averages of the F2 layer critical frequency
(foF2), its peak height (hmF2), and the E-region critical
frequency (foE) acquired during geomagnetically quiet days from September 2017 to August 2018. The monthly averages are compared to the 2016 version
of the International Reference Ionosphere (IRI) model predictions in order
to study its performance close to the center of the South America Magnetic
Anomaly (SAMA), which is a region particularly important for high-frequency
(HF) ground-to-satellite navigation signals. The foF2 estimated with
the Consultative Committee International Radio (CCIR) and International
Union of Radio Science (URSI) options makes good predictions throughout the year, whereas, for hmF2, it is recommended to use the SHU-2015 option
instead of the other available options (AMTB2013 and BSE-1979). The IRI-2016
model outputs for foE and the observations presented very good
agreement.
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