http://ulcar.uml.edu/framesn.htm

http://car.uml.edu/WatchIt/latestIonograms.html

http://giro.uml.edu/IonogramMovies/24hi.php?nc=9

http://ulcar.uml.edu/stationmap.html

http://www.ionosonde.iap-kborn.de/ionolink.htm

http://www.vhfdx.de/iono.htm

https://lgdc.uml.edu/common/DIDBFastStationList

http://www.digisonde.com/digisonde-station-map.html

https://lgdc.uml.edu/common/DIDBYearListForStation?ursiCode=JR055  - JULIUSRUH

https://lgdc.uml.edu/common/DIDBYearListForStation?ursiCode=PQ052  - PRUHONICE

https://lgdc.uml.edu/common/DIDBYearListForStation?ursiCode=DB049  - DOURBES

https://lgdc.uml.edu/common/DIDBYearListForStation?ursiCode=RO041  - ROM

https://lgdc.uml.edu/common/DIDBYearListForStation?ursiCode=RL052  - CHILTON

https://lgdc.uml.edu/common/DIDBYearListForStation?ursiCode=FF051  - FAIRFORD

https://lgdc.uml.edu/common/DIDBYearListForStation?ursiCode=AL945 - Alpena

https://www.ngdc.noaa.gov/stp/IONO/rt-iono/realtime/RealTime_foF2.html

https://www.ngdc.noaa.gov/stp/IONO/rt-iono/realtime/RealTime_foEs.html

https://www.ngdc.noaa.gov/stp/IONO/rt-iono/realtime/

https://www.ngdc.noaa.gov/stp/IONO/rt-iono/latest/latest.html

https://www.ngdc.noaa.gov/stp/IONO/rt-iono/realtime/DB049_foEs.png

https://www.ngdc.noaa.gov/stp/IONO/rt-iono/realtime/DB049_foF2.png

https://www.ngdc.noaa.gov/stp/IONO/rt-iono/realtime/PQ052_foEs.png

https://www.ngdc.noaa.gov/stp/IONO/rt-iono/realtime/PQ052_foF2.png

https://www.ngdc.noaa.gov/stp/IONO/rt-iono/realtime/JR055_foEs.png

https://www.ngdc.noaa.gov/stp/IONO/rt-iono/realtime/JR055_foF2.png

https://www.ngdc.noaa.gov/stp/IONO/rt-iono/realtime/VT139_foF2.png

https://www.ngdc.noaa.gov/stp/IONO/rt-iono/realtime/VT139_foEs.png

https://www.ngdc.noaa.gov/stp/IONO/rt-iono/realtime/EB040_foF2.png

https://www.ngdc.noaa.gov/stp/IONO/rt-iono/realtime/EB040_foEs.png

https://www.ngdc.noaa.gov/stp/IONO/rt-iono/realtime/AL945_foEs.png

https://www.ngdc.noaa.gov/stp/IONO/rt-iono/realtime/AL945_foF2.png