A case of degraded GPS performance during a short- term ionospheric disturbance in Northern Adriatic

Ionospheric disturbances are the proven cause of degradation of the GNSS performance. Resulting from the space weather processes, ionospheric disturbances modify the vertical ionospheric profile, thus changing the Total Electron Content (TEC) encountered by satellites' rays on their way towards the GNSS receiver. Here we report a case of the short-lived ionospheric disturbance, detected by SID monitor located at the GNSS laboratory, Faculty of Maritime Studies in Rijeka, Croatia, and the effects it causes to the GPS positioning performance, as observed by the single-frequency maritime GPS receiver situated at the same venue. Observed correlation between GPS and SID monitor observables points to perspective of establishing a model for the ionospheric disturbances identification, which is to be examined further in the mid-term research.