2026-04-13T18:23:50Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/2074122025-12-05T16:38:09Zcom_2072_1057col_2072_478823col_2072_478917

00925njm 22002777a 4500 dc Hernández Pajares, Manuel author García-Rigo, Alberto author Monte-Moreno, Enric author Liu, Qi author Roma-Dollase, David author Yang, Heng author Béniguel, Yannick author Moreno-Borràs, David author Fors Aldrich, Octavi author Orus-Perez, Raul author Ventura-Traveset, Javier author 2024-02-09T18:11:37Z 2024-02-09T18:11:37Z 2023-12-09 2024-02-09T18:11:37Z This work presents a summary of the continuous non-stop (hereinafter 24/7) real-time measurement and warning system for EUV solar activity, which is based on worldwide multifrequency Global Navigation Satellite Systems (GNSS) observations. The system relies on continuous tracking of the intensity of expected global patterns in the Earth's ionosphere's free electron distribution, which are associated with solar flares. The paper includes a discussion on the foundations of GNSS Solar Astronomy, along with details on its real-time implementation that began in 2011. Furthermore, a summary of the corresponding validation is provided, comparing it to external and direct solar EUV flux measurements obtained from SOHO-SEM. Finally, there will be a brief mention of the ongoing e orts to extend this technique to detect huge extra-solar sources. Eclipsis solars Ionosfera Sistema de posicionament global Solar eclipses Ionosphere Global Positioning System GNSS Solar Astronomy in real-time during more than one solar cycle