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Propagation News – 21 October 2018Fri 19th Oct 2018 15:34 BST

The sun remained pretty well spotless in the latter half of this week, with a solar flux index of 70 at the time this report was being prepared. But after an email from a GB2RS listener it is probably a good idea to recap how sunspot numbers are calculated. We count each sunspot as one, […]

Propagation News – 14 October 2018Fri 12th Oct 2018 14:08 BST

Last week was not very good for HF propagation, with the effects of an enormous solar coronal hole, and its associated high-speed solar wind, sending the K-index soaring. There were, however, some upsides. The initial positive phase of a geomagnetic storm saw maximum useable frequencies rise to more than 21MHz during the afternoon and early […]

Propagation News – 7 October 2018Fri 5th Oct 2018 15:37 BST

There are signs that ionospheric conditions are improving as we head into autumn. This isn’t unexpected; as the ionosphere cools there is a chemical shift towards more monatomic species that are easier to ionise. The 4U1UN New York, VE8AT Nunavut and ZS6DN Pretoria beacons on 14.100MHz were all audible at the same time on Wednesday, […]

Propagation News – 30 September 2018Fri 28th Sep 2018 14:07 BST

At the risk of sounding very samey, the solar flux index remained at around 67-68 with zero sunspots this week, and just a few points off what we can expect at absolute solar minimum. As predicted, geomagnetic conditions were relatively poor at the beginning of the week, but did improve slightly later on, although the […]

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