Index of /wdc/iondata/au Australian Bureau of Meteorology https://downloads.sws.bom.gov.au/wdc/iondata/au/

Digital Ionogram Data Base (DIDBase) Lowell GIRO Data Center https://giro.uml.edu/didbase/scaled.php

Nobeyama Radio Polarimeters National Astronomical Observatory of Japan https://solar.nro.nao.ac.jp/norp/index.html

Manually scaled parameters National Institute of Information and Communications Technology https://wdc.nict.go.jp/Ionosphere/en/archive/isdj_manual_txt.html

Solar radio flux - solar monitoring program Space Weather Canada https://spaceweather.gc.ca/forecast-prevision/solar-solaire/solarflux/sx-en.php

Sunspot Number Sunspot Index and Long-term Solar Observations https://www.sidc.be/SILSO/datafiles