Radio Propagation Forecasting
HF propagation forecasting is essential for predicting how high-frequency (HF) radio waves travel through the ionosphere, which can vary based on solar activity, time of day, and atmospheric conditions. Here are some key points, with links to this website and external resources:
- Maximum Usable Frequency (MUF): This is the highest frequency that can be used for communication between two points via ionospheric refraction. It varies with time and location.
- Optimum Working Frequency (OWF): This is typically about 85% of the MUF and represents the most reliable frequency for communication.
- Real-Time Bands' Activity Maps: Variaty of websites like DXview Map provide real-time data on radio propagation conditions, showing activity on various bands and signal-to-noise ratios.
- Near Real-Time Charts: Online charts of regional propagation conditions, all based on recent ionosonde measurements.
- Real-Time Propagation Tools
- Real-Time Applications
- Prediction software applications: Find links with reviews, overviews, and explanations of various software packages.
- Space Weather Impact: Solar flares, geomagnetic storms, and other space weather events can significantly affect HF propagation. Monitoring space weather forecasts can help predict these impacts.
External References:
- HF Propagation Map
- Real‑Time HF Propagation Space Weather - hamwaves.com
- Propagation, Space Weather, and Sunspot Cycle Resource Center - HF Radio
- G0KYA's HF Propagation Predictions from the UK
- sporadic-E propagation at VHF
Read more on this site about Propagation conditions and short-term forecasts.
The project "Understanding HF Propagation" focuses on near-real-time indicators and explains what they mean.