Geomagnetic and GNSS Scintillation Data Associated With the Study "Space Weather Drivers of the EGNOS Service Degradation on 10 October 2024"

This dataset provides derived geomagnetic and ionospheric parameters supporting the study: "Space Weather Drivers of the EGNOS Service Degradation on 10 October 2024",by M. Flores-Soriano, C. Cid, A. Collado-Villaverde, I. Maseda-Zurdo and A. Reche On 10 October 2024, the European Geostationary Navigation Overlay Service (EGNOS) experienced significant degradation of its Safety of Life (SoL) services over the Mediterranean region. The associated study analyzes the full Sun–Earth chain, from solar eruptions to ionospheric impacts on GNSS signals. This dataset includes the original data products generated by the authors: - Local Disturbance index (LDi) computed at five INTERMAGNET observatories: MMB (Memambetsu, Japan), IZN (Iznik, Turkey), SFS (San Fernando, Spain), FRD (Fredericksburg, USA) and HON (Honolulu, USA)- GNSS amplitude scintillation index (S4) measured at the ALCA station (Alcalá de Henares, Spain)- Satellite azimuth and elevation angles associated with the scintillation measurements The LDi index provides high temporal resolution (1-minute) characterization of local geomagnetic disturbances, while the S4 index quantifies ionospheric scintillation affecting GNSS signals, which is directly linked to navigation performance degradation. IMPORTANT:This dataset contains only the data products generated in this work. Additional datasets used in the analysis (including geomagnetic indices such as Kp, Dst, SYM-H, solar wind data, and GNSS observations from IGS stations) are publicly available from their respective providers and are fully described and referenced in the associated publication. The scintillation data are derived from 50 Hz GNSS measurements at the ALCA station, including thermal noise correction, and aggregated to 1-minute resolution. The results presented in the associated study show that the most severe GNSS signal degradation occurred during the passage of a sheath region following an interplanetary shock, with scintillation affecting more than 40% of tracked satellites at some locations. INTERMAGNET data are acknowledged for providing high-quality geomagnetic observations (www.intermagnet.org), along with the operating institutes including JMA, KEORI, RIOA, and USGS. — — —NOTE ON ACCESS: Access to the files is currently restricted while the accompanying scientific publication is under review. The data will be made openly available following publication.