Propagation

http://www.hamqsl.com/solar101vhf.php

HF propagation by N0NBH Paul Herrman


http://www.hrdlog.net/graph.aspx?type=p

Actual activity in real-time for each band


http://digisonde.oma.be/cgi-bin/latest.exe?

Measurement of ionospheric in Dourbes, Belgium


http://www.sws.bom.gov.au/Images/HF%20Systems/Global%20HF/HAP%20Charts/New%20York%20LDOCF.gif

Ionospheric map in real-time


http://www.sws.bom.gov.au/Images/HF%20Systems/Global%20HF/Ionospheric%20Map/West/fof2_maps.png

Ionospheric map with an average of the last 7 days


https://www.timeanddate.com/scripts/sunmap.php?

Real time grey-line-map