Ionospheric electron content over brazilian low latitude and its comparison with the IRI and supim models

Details Ionospheric electron content over brazilian low latitude and its comparison with the IRI and supim models Ionospheric electron content over brazilian low latitude and its comparison with the IRI and supim models

Jan 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996adspr..18..245d&link_type=abstract

Advances in Space Research, Volume 18, Issue 6, p. 245-248.

Mathematics

3

Scientific paper

Ionospheric Electron Content (IEC), measured at the Brazilian low latitude station of Cachoeira Paulista (22.5 degS, 45 degW, dip latitude 14 degS) was compared with IEC calculated using the IRI-90 and Sheffield University Plasmaphere-Ionosphere (SUPIM) models for a large range of solar fluxes at 10.7 cm (F10.7). The analysis of the F10.7 influence on IEC showed that, for Cachoeira Paulista (CP) at 05 LT (around the diurnal minimum), there is a good agreement between the IEC measurements and the models. At 16 LT (around the diurnal maximum), substantial discrepancies were observed in the IRI-90 results while SUPIM presents a good agreement up to F10.7 ~ 200. The measured IEC diurnal variation is better represented by SUPIM, mainly during higher F10.7. At low latitudes two critical parametric inputs for the SUPIM mathematical model are the equatorial exB plasma drifts and thermospheric neutral winds. Therefore, updated values of these parameters should be introduced in the model calculations everytime they are available. At CP, a station located close to the southern Appleton anomaly peak due to the fountain effect, where large discrepancies between IRI-90 and observations were found mainly with high F10.7, this model should include adequately this effect, which we believe is the main reason for the discrepancies.

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