GB2RS Propagation News
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 […]
Propagation News – 20 July 2025
Space weather has been a bit like our terrestrial weather this week. We have had sunspots, some C-class solar flares, some coronal mass ejections and a large coronal hole – unsettled, you could say! Luckily, the coronal mass ejections were not Earth-directed, but the Kp index did rise to 5 on the 15 July and […]
Propagation News – 13 July 2025
Last week was characterised by settled geomagnetic conditions, but a relatively low solar flux index. The Kp index hit 5.33 on the 6 and 7 July but was otherwise around 1 or 2 for the rest of the week. These settled conditions were helpful to HF propagation, although the maximum usable frequency over a 3,000km […]
Propagation News – 6 July 2025
It looks like the Space Weather Prediction Centre, which supplies the forecasts for NOAA, were overly cautious last week. Despite predicting geomagnetic disturbances, we had quite a calm week. The Kp index rose to 3.33 on a few occasions, but that was it. We ended up with settled geomagnetic conditions and a solar flux index […]
