https://www.ncei.noaa.gov/products/space-weather/legacy-data/mirrion-2-real-time-ionosonde
Mirrion 2: Real Time Ionosonde Data Mirror | National Centers for Environmental Information (NCEI)
Apr 25, 2025 - The Mirrion 2 system collects ionosonde soundings from a worldwide collection of ground stations and makes the data available to the public.