Abstract
This paper dissertates about the influence of space weather event from September 2017 on parameters NAC and NIC in ADS-B messages. Space weather have potential to influence GNSS navigation. Especially in the aviation, where we depend on th GNSS more. Therefore we examined the influence of solar flares on the aviation navigation system of commercial aircraft. We used data broadcasted by ADS-B system during the most severe space weather event. Parameters NAC and NIC describe the level of reliability of the aircraft position information based on the GNSS. Therefore, they might be partially used as sensors of any irregularities in GNSS signal. We focus on these parameters during one of the most severe solar flare in recent years to establish if there is any observable influence of the space weather on these parameters. We were able to prove that even during this severe flare that there was no degradation in the availability of the GNSS.
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