ABSTRACT
Modern technological and socio-economic systems increasingly rely upon the operation and performance of satellite navigation systems (Thomas et al, 2011, Filjar & Huljeniü, 2012). The GNSS vulnerabilities and risks assessment has become a major subject of numerous field studies in various positioning environments (Filjar & Huljeniü, 2012). The GNSS performance response to space weather and ionospheric disturbances is one of the cornerstones of such an assessment (Hapgood & Thomson, 2010, American Meteorological Society, 2011, Filjar, 2008).
