Current ionograms & critical frequencies

The links below provide information on ionospheric stations and data from around the world.

Please note the RSGB is not responsible for the content of external websites.

• Worldwide ionograms Juliusruh
• Kiruna magnetogram
• Lycksele magnetogram
• Dourbes (Belgium)
• Svalbard
• Rome
• Athens
• Prague
• DIDBase  List of Ionogram Stations
• Dias – European Digital Upper Atmosphere server. Registration required
• Interpreting Digital Ionosondes– A brief tutorial