GB2RS Propagation News
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 […]
Propagation News – 26 January 2025
This week, ending Sunday 26 January, has looked a lot like a repeat performance of two weeks ago. The majority of the sunspots are in the western hemisphere with very few in the eastern side. This means that the solar flux index could drop over the coming week unless there are sunspots ready to rotate […]
Propagation News – 19 January 2025
It looks like the lull in sunspot activity is coming to an end as the solar flux index rose to 174 on Thursday 16 January, after a week in the 150s and 160s. The Sun was fairly bare, but there are now signs of more sunspot activity rotating into view. There have been no X-class […]
Propagation News – 12 January 2025
First, let’s take a look at last week’s solar activity. As predicted, the solar flux index declined to the 160s. We had one X-class solar flare on the 4 January and there have been 11 M-class flares since then. The net result was that the ionosphere was unsettled from the 4 to the 6 January […]
