GB2RS Propagation News
Propagation News – 30 July 2023
It was a mixed bag last week with periods of settled conditions, but two periods when the Kp index was above four. These unsettled geomagnetic conditions impacted HF, subduing signals and generally not helping at all. The cause was a coronal mass ejection, or CME, that passed Earth late on Tuesday 25 July. This triggered […]
Propagation News – 23 July 2023
The Sun continues to be peppered with spots with a solar flux index of 189 on Thursday the 20 July. However, sunspots can bring solar flares and Coronal Mass Ejections, or CMEs, which can be detrimental to good HF conditions. We have been relatively lucky over the last week as the flares have mostly been […]
Propagation News – 16 July 2023
Last week saw the arrival of one of the biggest sunspots of this cycle. Active region 3363 could swallow the Earth four times over. It is a source of M-class flares, but at the time of writing hasn’t produced any X-class events. A new sunspot region 3372 has just rotated into view and has also […]
Propagation News – 9 July 2023
NOAA’s prediction that the Solar Flux Index, or SFI, would decline last week didn’t come to fruition. In fact, the SFI stayed in the 160s and 170s until Thursday, when it declined to 155. The Sun produced more than 160 sunspots in June, the highest monthly number in more than two decades. This has led […]
Propagation News – 2 July 2023
The solar flux index stayed in the 150s and 160s last week, which is good news for HF propagation. From a flare and CME perspective, we have been lucky in that we have only had a few solar flares, all of which have been C- or M-class. As a result, the Kp index has remained […]
Propagation News – 25 June 2023
We had yet another week of high solar flux, plenty of sunspots, but also a major solar flare. The solar flux index reached 180 on 20 June 2023 with a massive spread of sunspots across both solar hemispheres. But an X-class solar flare erupted on the same day. This was only just X-class though, as […]
