RSGB PROPOGATION:
Propagation News – 19 October 2025 | Fri 17th Oct 2025 15:59 BST |
Conditions over the past week have been reasonable with a relatively high solar flux and lower Kp indices. This resulted in a maximum usable frequency (MUF) over a 3,000km path, in excess of 35MHz. This is just what October was meant to be like! But all good things come to an end, and there are […] | |
Propagation News – 12 October 2025 | Thu 9th Oct 2025 13:07 BST |
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 | Fri 3rd Oct 2025 12:15 BST |
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 | Fri 26th Sep 2025 14:54 BST |
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 […] |