GB2RS Propagation News
Propagation News – 9 March 2025
We started last week with geomagnetic disturbances that saw the Kp index rise to a maximum of 5.67 on the 28 February and then hover around the 4.5 mark for the next couple of days. As predicted, the rest of the week went quite well, with the Kp index in the range of one to […]
Propagation News – 2 March 2025
We had another week of mixed geomagnetic conditions. The Kp index rose to a high of five with visible aurora over the UK at times. Two large coronal holes are now both facing Earth. A solar wind stream flowing from these zones is expected to flow past Earth, possibly on Friday 28 February or Saturday […]
Propagation News – 23 February 2025
It seems we were a little over-ambitious in suggesting that last week would be better for HF propagation. It looked like we would avoid coronal mass ejections and see the Kp index fall to lower levels. Unfortunately, the Sun had other ideas and a fast-moving solar stream, often moving faster than 500 km/s, had a […]
Propagation News – 16 February 2025
Two large coronal holes on the Sun’s surface have been spraying solar material towards Earth, pushing the Kp index to a high of 4.67. The solar wind speed has been consistently higher than 500 kilometres per second and, with a south-pointing interplanetary magnetic field, the plasma has flooded into Earth’s magnetic field. There have been […]
Propagation News – 9 February 2025
Last week went pretty much as predicted. The solar wind from a large coronal hole impacted the Earth on Saturday 1 February, pushing the Kp index to four. The hole was so large that the geomagnetic disturbance lasted until the early evening on Sunday. Once the solar wind speed had dropped, things got back to […]
Propagation News – 2 February 2025
Last week was pretty unremarkable as far as the Sun goes, but it looks like that is about to change. The seven days preceding Thursday 30 January were characterised by reasonably settled geomagnetic conditions, with a maximum Kp index of 3.67 and a solar flux index that fell from 205 on the 24 January, to […]
