GB2RS Propagation News
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 […]
Propagation News – 29 June 2025
The last week was good from a geomagnetic disturbance point of view. Up until Wednesday, the 25th, the Kp index had not been higher than 3.67, and had mostly been in the ones and twos. This helped HF propagation to a great extent. Sunspots have been present with the solar flux index sitting at 120 […]
Propagation News – 22 June 2025
Last week we mentioned a large coronal hole on the Sun that might cause problems. The hole is so large that it is still Earth-centric seven days later. We had expected the hole to increase the Kp index due to the solar wind emanating from it. However, as of Thursday, 19 June, conditions remained quiet […]
Propagation News – 15 June 2025
Propagation was a mixed bag last week with occasional Kp index rises but a solid solar flux index which hit 141 on Thursday 12 June. We also had some Sporadic-E short-skip conditions on the HF bands which brought some surprises. We are now in June so the summer HF doldrums are well under way. But […]
