Accuracy assessment of the quiet-time ionospheric F2 peak parameters as derived from COSMIC-2 multi-GNSS radio occultation measurementsIurii Cherniak, Irina Zakharenkova, John Braun, Qian Wu, Nicholas Pedatella, William Schreiner, Jan-Peter Weiss and Douglas HuntJ. Space Weather Space Clim., 11 (2021) 18DOI: https://doi.org/10.1051/swsc/2020080