GB2RS Propagation News
Propagation News – 31 August 2025
This week saw a change in HF propagation with a perceptible move towards more autumnal conditions. The 10 and 12m bands have started opening up to the USA, at least on FT8. As we move into September this will improve further. Also, as we head towards the autumnal equinox, we can expect better conditions on […]
Propagation News – 24 August 2025
Last week was relatively good from an HF propagation standpoint, with only a few periods with an elevated Kp index thanks to a high-speed solar wind stream from a coronal hole. The Kp index hit 4.67 on the 19 August and 4 again on the 20 August due to the solar wind hitting earth at […]
Propagation News – 17 August 2025
Last weekend was characterised by unsettled geomagnetic conditions caused by a massive coronal hole on the Sun. At one point, the Kp index got up to 6, with a corresponding decrease in maximum usable frequencies, or MUFs. In fact, the Dourbes Digisonde failed to record much at all over a six-hour period. Luckily, that disruption […]
Propagation News – 10 August 2025
Over the last week we had nearly ideal solar conditions for HF propagation. These included low geomagnetic indices and a reasonable solar flux index, hovering around the 150 mark. Other solar events of note included six M-class solar flares. The only stumbling block is the time of year, with summer seeing lower maximum usable frequencies, […]
Propagation News – 3 August 2025
Last week was very much a repeat performance of the week before. We had relatively calm geomagnetic conditions and few solar flares to contend with. The only flares were minor C-class events. The Kp index never got above 3 and the solar flux index was in the 140s to 150s. The F2-layer maximum usable frequency […]
Propagation News – 27 July 2025
It was a bit of a mixed bag last week. The first half saw settled geomagnetic conditions, but from the 22 July we had a disturbance thanks to output from a solar coronal hole. This saw the Kp index rise to 4.67 and ultimately 5. The stream from the Sun reached around 730 kilometres per […]
