Instantaneous global maps of ionospheric critical frequency GIM-foF2 for evaluation of the ionospheric weather

Global instantaneous ionospheric maps of foF2 critical frequency GIM-foF2 and the ionospheric weather W(foF2) maps are produced with PRIME Kriging technique with a resolution of 1 h, 5° and 2.5° in time, longitude and latitude respectively for 1998-2017. The results are obtained for the first time for the global super-storm on March, 1989, demonstrating a new opportunity for the ionosphere investigations in the past since the 19^th solar cycle when ionosonde network has been active while none navigational satellite data existed.