SYS: ONLINE|UTC --:--:--|BAND: HF
SWR: 1.2PWR: 100WQTH: EN52
Interactive model

Propagation Forecaster

Model the ionosphere and see which bands will open between two points over the next twenty-four hours.

Educational simulation. This model uses a simplified physical approximation. Treat the figures as an illustration of the principle, not as a prediction for a real installation. Real antennas must be built and sited in accordance with local regulations and the instructions for the equipment.

ViewInteractiveBS-3D-031
Drag to orbit · scroll to zoom

Static reference view

The interactive model needs WebGL, which this browser is not providing. The reference drawing below shows the same arrangement.

Propagation Forecaster static reference drawing

What it teaches

  • How the D, E, F1 and F2 layers form and why only F2 supports long-distance contacts.
  • What the maximum usable frequency is, and why it changes through the day.
  • Why the low bands are better at night and the high bands better in daylight.
  • How the terminator moves and what that means for grey-line contacts.

What it reports

MUFLUFPer-band availabilityBest operating window

Controls

FrequencyPowerAntenna typeTime of daySolar flux indexK index

Performance and access

The 3D library loads only on this page, never on the home page or the reference pages. If WebGL is unavailable the tool falls back to a static reference drawing with the same parameters. On a small screen the static view is shown first, with a button to load the interactive version. Reduced-motion preferences stop automatic rotation and animation.

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