GB2RS Propagation News
Propagation News – 12 October 2025
We finally got rid of the high-speed solar wind stream, which caused havoc on the HF bands. But we are not out of the woods yet! Last week saw the Kp index hit 6.67 on 2 October, and it was often up around 4 or more. Even though the Kp index eventually reduced, the ionosphere […]
Propagation News – 5 October 2025
Last week was characterised by very unsettled geomagnetic conditions with a Kp index that reached 7.33 on 30 September and was often above 5. This is not good for HF propagation! But what caused this? A high-speed solar wind stream at around 750 kilometres per second, coupled with the Bz component of the Sun’s magnetic […]
Propagation News – 28 September 2025
Last week was good for HF propagation for a number of reasons. Firstly, we are now entering autumn, which offers better propagation prospects than summer. Secondly, the solar flux index has remained high at up to 184 as of last Thursday 25 September. We had a week of near-normal geomagnetic conditions, with a low Kp […]
Propagation News – 21 September 2025
Last week we said that it looked like someone had thrown a switch on the Sun and all the sunspots had vanished. Well, this week we’re pleased to report they’re back! We have eight sunspot groups, spread evenly throughout the Sun’s hemispheres. Interestingly, the northern hemisphere sunspots are close to the equator, which is what […]
Propagation News – 14 September 2025
As of Thursday 11 September, it looked like someone had thrown a switch on the Sun to turn off all new sunspots! Unless there is a big change, there will be no sunspots visible on the Sun’s surface today, the 14 September. It is clear that we are no longer at solar maximum. A bigger […]
Propagation News – 7 September 2025
Last week’s aurora may have come as a bit of a surprise! The propagation segment for GB2RS is usually written on a Thursday, but the aurora was sparked by a solar flare that took place two days later, at 2002UTC on the 30 August. As we don’t have a crystal ball we couldn’t have predicted […]
