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Real-Time Predicted Maximum Usable Frequency Conditions World-Wide

The following information is provided by the Solar Terrestrial Dispatch and is used with permission. This site contains a wealth of solar and ionospheric conditions and is well worth a visit. The following chart is produced using PROPLAB PRO Version 2.0 software for the IBM PC and compatible systems. Skycom Pro is an ionospheric laboratory for your personal computer. The MUF is the highest frequency at which long range HF communications is likely to occur. To maximize your range, you will want use a radio frequency close to the MUF. Note that the MUF is a prediction and the actual MUF may be lower or higher than the predicted frequency. Visit Solar Terrestrial Dispatch's MUF page to learn more about how to interpret this map.

Visit Coordinated Amateur Radio Observation System (CAROS) and submit your real-time propagation reports or view other propagation reports.

Predicted Maximum Usable Frequency (MUF)

See Also Hourly Updated Views of Polar Aurora From Satellites

Current foF2 Propagation Conditions Southern Hemisphere

The following information is provided by IPS Radio and Space Services, Sydney Regional Warning Centre, Australia. Used by permission of IPS Radio and Space Services. IPS Radio and Space Services provides excellent solar and ionospheric propagation conditions of particular value to those living in the Southern Hemisphere. The foF2 frequency is known as the F2-layer critical frequency. This is the highest frequency at which a radio signal will reflect from the ionsophere at vertical incidence (going straight up).

Current foF2 Propagation Conditions Southern Hemisphere


Current Solar Image from Learmonth, Australia Courtesy of IPS



See Learmonth Solar Images for more images and data.

Learmonth, Australia K-indices


Current solar flux measurement

Current solar flux

Additional Propagation Resources

The SPIDR Ionosphere forecasting tool is available to produce custom F2 propagation layer forecasts.

Solar Terrestrial Dispatch, Univ. of Lethbridge, Alberta, Canada.

IPS Radio and Space Services, Sydney Regional Warning Centre, Australia.