The utilities below have proved to be very useful. Ever tried to talk to someone on the radio and it doesn’t seem to be working? Its normally caused by conditions in the ionosphere, a geomagnetic storm or other satellite / solar event! The information below is extremely useful for looking at propagation and the factors affecting it. The depth of information provided is much more in depth than you will ever be expected to understand even on the Advanced Signalling course!
Also included below are links to current frequency prediction graphs showing the usable frequencies dependent on the time of day and the distance you need to communicate over. IMPORTANT: Although every care is taken, these predictions are only considered accurate for about 5 hours on from the published times during the day, and far less – often for only an hour or two – during the evenings/night. If your radio operation/exercise is important, return here and check regularly: This site updates hourly at half-past every hour.
The Ionosphere is mostly responsible for how HF radio waves get from the transmitter to the receiver. The Ionosphere is affected greatly by The Sun’s radiation. Below is a current view of The Sun from a satellite in the earths orbit. It will show any sunspots or solar flares clearly. There is also information about Geomagnetic Storms, Solar Radiation Storms and Radio Blackouts. Further information can be found by clicking each of the links.
Solar X-rays: br>Geomagnetic Field: br>
Below is a worldwide daylight map with Maximum Useable Frequency (MUF) prediction to 11 destinations worldwide. This has been provided by HamQSL maintained by Paul, N0NBH. It is useful when working word wide to see how the ionosphere is affected by Sunlight and what effect this has on available frequencies! Other versions are available from his website.
Conditions in the D region of the ionosphere have a dramatic effect on high frequency (HF) communications and low frequency (LF) navigation systems. The global D Region Absorption Predictions (D-RAP) below depicts the D region at high latitudes where it is driven by particles as well as low latitudes, where photons cause the prompt changes.
Below is a graphical representation of the satellite environment over the last 3 days. This plot combines satellite and ground-based data in an attempt to present an overview of the current satellite environment (particularly at geosynchronous altitude). Although this data is of interest to the satellite community, it does not include all parameters and energy ranges known to be associated with satellite anomalies.