Last Updated on May 19, 2024 by KC7NYR

Radio propagation is the way radio waves travel or propagate when they are transmitted from one point to another and affected by the medium in which they travel and in particular the way they propagate around the Earth in various parts of the atmosphere. For detail information visit Electronic Notes Website.

Radio Propagation: Space Weather : Sunspot Cycle Information a live reference resource site for solar and geomagnetic data and images. Visit propagation for details.

For dynamically created Sunspot Cycle Information from many sources using automation, and the information contained is as fresh as possible. This page will reload every 15 minutes, which will refresh any content that has changed since last viewing

The National Oceanic and Atmospheric Administration Space Weather Prediction Center forecasts a solar maximum between 105 and 125, with the peak occurring between November 2024 and March 2026. There is broad consensus that solar minimum is ongoing in 2020 — or may have already occurred — and that Cycle 25 will have no major change in the level of solar activity compared to Cycle 24.

You can get custom professional-grade high-frequency (3-30 MHz) propagation predictions online.

HF Radio Propagation – NW7US –

For customizable propagation charts, visit

ACE-HF is propagation forecasting and modeling for Amateur Radio as well as for Shortwave radio Listening and general HF operation –

QRZ Real-time band conditions –

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