GB2RS Propagation News
Propagation News – 29 November 2020
Last week represented a good example of how solar cycle 25 is progressing. We started the week on the 22nd with a solar flux index, SFI, of 88 and a sunspot number of 35. Just to recap, that doesn’t mean there were 35 sunspots, as we count each sunspot group as 10 and each spot […]
Propagation News – 22 November 2020
Last week was not bad for HF propagation, but probably not as good as the previous period. The solar flux index remained in the mid-to-high 70s, but the upside was that we had quiet geomagnetic conditions, which helped settle the ionosphere. The result was that maximum usable frequencies over 3,000km remained quite high, with 12 […]
Propagation News – 15 November 2020
The Sun really shone last week, in more ways than one. Large sunspot group 2781 pushed the solar flux index to 91 with a sunspot number of 40 at the weekend, a figure that we haven’t seen for many years. This was coupled with quiet geomagnetic conditions with a maximum Kp index of two, but […]
Propagation News – 8 November 2020
Sunspots are a bit like buses. You wait forever and three come along at once! Last week we had active regions 2778 and 2779, which pushed the solar flux index up to 88. This week we have sunspot region 2781, which is a monster. At the time of writing, this region had pushed the SFI […]
Propagation News – 1 November 2020
Last week saw more evidence that Solar Cycle 25 is definitely under way. Large sunspot group 2778 caused the solar flux index to rise to 82. And it then got even better when it was joined by active region 2779, which pushed the SFI up further to 88 on Thursday. This is the first time […]
Propagation News – 25 October 2020
The last week was dominated by sunspot region 2776, which pushed the solar flux index to 75. Geomagnetically, it was a mixed bag though, with the Kp index peaking at four on Wednesday, but otherwise being relatively quiet and showing zero on Tuesday. The sunspots, plus the October seasonal enhancement, meant that the HF bands […]
