Speaker
Description
The 10 May 2024 geomagnetic storm, called the Gannon Storm, is known to be the biggest geomagnetic storm in 20 years, reaching G5 (extreme) on NOAA space weather scales and causing auroras visible from Southern Europe. The ionospheric irregularities created by such a storm can impact radio-based technologies, such as the Global Navigation Satellite System (GNSS), by delaying, scattering and diffracting, signals travelling through them. The Satellite Based Augmentation Systems (SBAS) broadcasts corrections to single-frequency GNSS users, including ionospheric corrections.
Were SBAS performances impacted by the Gannon storm ? This study will present the impacts of the storm on mid to high latitude SBAS performance and discuss the different indices for characterising geomagnetic and ionospheric activity. We show that this extreme geomagnetic storm may not be the most harmful to SBAS and discuss the need for space weather local operational indices and alerts tailored to GNSS/SBAS technologies. This need is backed by the observations of much smaller geomagnetic events on the NOAA/Kp scale, but with stronger impacts on SBAS performances.
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