Ionospheric characterization by statistics analysis of Latvian GBAS 11 year selective daily observations

The space weather impact on Global Navigation Satellite System (GNSS) positioning, navigation and timing has been recognised as a serious threat for Satellite Based Augmentation Systems (SBAS) and Ground Based Augmentation Systems (GBAS) operational quality, as well as for many other positioning and navigation applications for satellites, aviation, cars, trucks, farming, construction, snow removal etc. Distortions of GNSS signals are of concern for a number of applications, especially for Safety-of-Life applications. The scope of this work is the ionospheric characterization by statistics analysis of Latvian GBAS 11-year selective daily observations with special emphasis on geomagnetic extreme events and ionospheric scintillations in the region of Latvia with latitude around 57ºN.