Abstract
This work aims to introduce the EISCAT incoherent scatter radar as a calibration tool for one of the most important parameter in ionospheric space weather, the vertical total electron content (TEC). Five successful EISCAT experiments in 1998 and 1999 have been used to calculate the vertical integrated total electron content (ITEC) values up to 498 km . They cover more than 257 h in 15 days during different solar and magnetic conditions. We compare these values with those TEC values evaluated from GPS measurements at Troms ø. We show that in some cases, the comparison reveals an underestimation of the TEC deduced from the GPS system. By exploring the geophysical conditions (magnetic field, electric field, solar wind, solar activity, IMF) during those cases we find that the under estimates are a result of a non-adequate consideration of the protonosphere. Further comparisons are being made with corresponding TEC values obtained from IRI and COSTprof ionospheric models. We show that the models can reproduce well the electron density profiles measured by EISCAT when they are fed with NmF2 and hmF2. Of the five experiments, the comparison reveals a better accuracy with COSTprof.
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