AATR an ionospheric activity indicator specifically based on GNSS measurementsJosé Miguel Juan, Jaume Sanz, Adrià Rovira-Garcia, Guillermo González-Casado, D. Ibáñez and R. Orus PerezJ. Space Weather Space Clim., 8 (2018) A14DOI: https://doi.org/10.1051/swsc/2017044
