What is a good propagation score for DX?

Anything above 75 means the bands should be in good shape and even SSB will get out. Between 55 and 75 is workable with CW or FT8. Below 35, weak-signal digital modes are the only reliable option. The score combines solar flux, geomagnetic activity, flare level, solar wind and your local grey line into one 0 to 100 figure.

What is a good solar flux index for 10m?

10m generally needs a solar flux index above about 150 for reliable worldwide F2 openings, and above 200 the band can stay open for most of the daylight hours. Below 100 the band is usually limited to sporadic E in season and short skip.

Does a high K-index kill HF propagation?

A K-index above 5 indicates a geomagnetic storm and will badly degrade HF, especially on paths crossing the auroral zone and the poles. The high bands lose their maximum usable frequency first, while the low bands suffer raised noise. A K-index below 3 is quiet and best for DX.

What is the grey line and why does it matter?

The grey line is the twilight band between day and night that sweeps around the Earth. For roughly an hour either side of your sunrise and sunset the D layer, which absorbs low band signals during the day, decays faster than the F layer. That short window often gives exceptional 160m, 80m and 40m DX along the terminator.

How often is the propagation data updated?

Solar and geomagnetic figures come directly from the NOAA Space Weather Prediction Center and refresh every ten minutes on this page. The planetary K-index itself is published every three hours, while solar wind and X-ray readings update every few minutes.

Live HF Propagation Conditions

HF Propagation Forecast & Solar Data

Monitor real-time solar conditions and HF propagation forecasts. Check solar flux, K-index, sunspot numbers and band conditions to plan your next QSO.

G7RDX Propagation Score

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Coordinated Universal Time

Propagation Score

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Fetching live space weather from NOAA…

One number for how the bands are behaving right now, and what to do about it.

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Live band conditions

Estimated MUF — · scored for your grid · bands above the MUF are unlikely to support F2 DX

Solar conditions

Live from NOAA SWPC

Geomagnetic conditions

A disturbed field closes polar paths and lifts noise long before the solar numbers look bad

Best time to operate today

Your grid Maidenhead locator. Localises sunrise, sunset and beam headings. Stored only in this browser.

All times UTC

How is this score calculated?

Component	Reading	Score	Weight

Six components, each scored 0–100 and combined with fixed weights. Where a source is unavailable its weight is redistributed across the rest, so the score stays on the same scale rather than being quietly dragged down. It is a model of likely conditions, not a guarantee — the bands always get the final say.

Data sources