Note:
Certain pages within the HF Systems category are updated frequently. Excluding warning notifications,
update intervals will be specified where applicable.
To refresh the page, hold down the "SHIFT" key and click the "Refresh" or "Reload" button on your browser to
refresh this page to obtain latest data.
These pages provide general propagation advice for HF communicators. Information available
includes inferred global propagation conditions, real time HF fadeout coverage charts,
regional ionospheric vertical MUF maps and Hourly Area Prediction charts.
FYI:
Derived TEC Maps are available here.
X-Ray Flux values can be obtained here.
Background information on HF propagation.
You can view an animation on space weather effects on HF communications (7Mb) here
HF Systems