Abstract
In this report the occurrence of TEC fluctuations and their impact on the Precise Point Positioning (PPP) errors at high latitudes for November 4, 2021 geomagnetic storm is presented. We used GPS observations of polar Ny-Ålesund (MLAT, 76.6°) and auroral Tromsø (MLAT, 66.9°) stations. The fluctuation activity and intensity of fluctuations was evaluated by ROT/ROTI indexes. At both stations the periods of the most intense fluctuations occurrences in GPS data coincided with strong increases in AE index. There is good agreement in dependence of fluctuation intensity (ROTI) and positioning errors. At Ny-Ålesund the errors were reached 4 m against 16 cm at during quiet conditions. At TRO1 strong intensification fluctuations led to a dramatic increase PPP errors.
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