How do the seasons affect HF radio propagation?
Seasonal changes in the Earth's ionosphere can have a substantial impact on HF (High Frequency) radio propagation.
The ionosphere is a layer of the Earth's atmosphere that includes charged particles and is critical for high-frequency radio propagation. The ionosphere "reflects" HF signals back to Earth, allowing for long-distance communication.
The ionosphere is often more ionized during the summer, allowing it to more efficiently reflect HF radio transmissions. As a result, radio waves can travel farther in the summer. Because there is less solar radiation during the winter, the ionosphere becomes less ionized, making it less effective at reflecting HF radio signals.
Overall, seasonal changes in the ionosphere can have a significant impact on HF radio propagation. It is important for HF radio operators to take these changes into account when planning communications, particularly when communicating over long distances.
You may find more detailed information in the main webpage, here. See also an index for HF Radio Propagarion.