GB2RS Propagation News
Propagation News – 23 March 2025
Last week was pretty unremarkable from an HF perspective. After the disturbed geomagnetic conditions on the 12 to the 14 when the Kp index rose to five, conditions were a little more settled. The solar flux index hit 204 on the 17 March but then declined back to the 180s. Having said that things were […]
Propagation News – 16 March 2025
We’ve had another week of disturbed geomagnetic conditions with the Kp index at four or five for long periods. On the evening of the 12 March, Kp was five and, at the time of writing, has stayed there for a total of five three-hour periods. This has taken its toll on the ionosphere with MUFs […]
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 […]
