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for predicting space weather effects on telecommunications, improving the accuracy of satellite navigation,
fly control vehicles and other systems that use transionospheric signals, because the ionospheric layer affects the
mentioned signals. In this work the Slant Total Electron Content (STEC) was calculated with a technique that
uses so-called «auxiliaries stations model», and a Chapman layer with scale height equal to atomic oxygen scale
height (CHO). The validity was checked with STEC measurements obtained from geosynchronous satellite signals,
for SIRIO-Mortelliccio link considering solstices and equinox, in high solar activity period. In general, the
deviations between predictions and measurements were lower than 30% for 16 h per day (average). The results
suggest that additional studies for other links and solar activity are required in order to improve the model predictions.
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