Information about GSFLAI and its validation with space-based EUV measurements:

• M. Hernandez-Pajares, A. Garcia-Rigo, J.M. Juan, J. Sanz, E. Monte, and A. Aragon-Angel, GNSS measurement of EUV photons flux rate during strong and mid solar flares, Space Weather, vol 10, S12001, doi:10.1029/2012SW000826, 2012.
• Monte‐Moreno, E., & Hernández‐Pajares, M., Occurrence of solar flares viewed with GPS: Statistics and fractal nature. Journal of Geophysical Research: Space Physics, 119(11), 9216-9227, 2014.
• Singh, T., Hernandez‐Pajares, M., Monte, E., Garcia‐Rigo, A., & Olivares‐Pulido, G., GPS as a solar observational instrument: Real‐time estimation of EUV photons flux rate during strong, medium, and weak solar flares, Journal of Geophysical Research: Space Physics, 120(12), 2015.

Description of the SISTED system:

• García-Rigo, A., Hernández-Pajares, M., Juan, J. M., & Sanz, J. (2007), Solar flare detection system based on global positioning system data: First results Advances in Space Research, 39(5), 889-895, 2007.
• Garcia-Rigo, A., Contributions to ionospheric determination with Global Positioning System: solar flare detection and prediction of global maps of Total Electron Content, PhD Thesis, Universitat Politècnica de Catalunya, Spain, 2012.