Ionospheric disturbance information generation methods and systems

System for providing ionospheric disturbance information applicable to a region of the Earth and suitable for use by at least one of

• a navigation satellite system, hereinafter abbreviated as “NSS”, receiver and
• a processing entity capable of receiving data from the NSS receiver
• in contributing to computing a positioning solution based on NSS signals received by the NSS receiver from a plurality of NSS satellites, hereinafter referred to as “first set of NSS satellites”, the system being configured for:
• generating, for a point, hereinafter referred to as “station”, on or near the surface of the Earth, ionospheric disturbance information, hereinafter referred to as “station-specific ionospheric disturbance information”, comprising at least one of:
• ionospheric scintillation information and ionospheric gradient information, wherein generating comprises
• computing, for each of a plurality of NSS satellites, hereinafter referred to as “second set of NSS satellites”, an ionospheric disturbance level, hereinafter referred to as “satellite-specific ionospheric disturbance level”, the second set of NSS satellites being any one of:
• different from the first set of NSS satellites, partially different from the first set of NSS satellites, and the same as the first set of NSS satellites, and
• computing a measure of the satellite-specific ionospheric disturbance levels over the second set of NSS satellites, the measure being hereinafter referred to as “ionospheric-disturbance-levels-summarizing measure”;
• and
• providing the station-specific ionospheric disturbance information being or comprising the ionospheric-disturbance-levels-summarizing measure.