Propagation

Ionosphere model
simplified model of the ionosphere.

Understanding Solar Indices


VOACAP

VOACAP (Voice of America Coverage Analysis Program) is free professional high-frequency (HF) propagation prediction software from NTIA/ITS, originally developed for Voice of America (VOA).

DR2D DX-Propagation

DXmaps

Great site with real time QSO/SWL information. Several options and overlays.
To get all options you need to register.

SolarHam

Space Weather Prediction Center

National Oceanic and Atmospheric Administration

Space Weather

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