GB2RS Propagation News
Propagation News – 1 August 2021
Last week the Sun was bursting with sunspots, with a solar flux index in the high 80s. But, by Thursday, we were looking at a different picture, with zero sunspots and a solar flux index of 79. We also had a geomagnetic disturbance, thanks to the arrival of a high-speed stream from a coronal hole […]
Propagation News – 25 July 2021
Sunspot numbers were down at the start of the week, but increased dramatically as the week went on. By Thursday the solar flux index was up to 94 with a sunspot number of 86. There were six active regions visible on the Sun. Although many of these sunspots were quite small and not very complex, […]
Propagation News – 18 July 2021
The solar flux index remained in the 70s last week, reflecting the lack of decent sunspots. What spots we did have were both minuscule and un-noteworthy. The high-speed wind stream from a large solar coronal hole impacted the Earth a little later than predicted. In the end, it hit us during the late afternoon and […]
Propagation News – 11 July 2021
As predicted, the solar flux index declined this week, ending at 76 on Thursday. This was due to the large sunspot regions 2835 and 2836 having rotated off the Earth-facing portion of the solar surface. But make a note to check the SFI around July 21 onwards when, hopefully, they will make a return. The […]
Propagation News – 4 July 2021
Well, NOAA certainly got the sunspot predictions wrong last week. It said that the solar flux index would be in the range 76 to 78 with a maximum Kp index of two. As it turned out, the SFI ended up way higher than this, peaking at 94 on Thursday. Active sunspot regions 2835 and 2836 […]
Propagation News – 27 June 2021
We had another week that was largely dominated by Sporadic-E openings. It is worth pointing out that Sporadic-E can and does have a blanketing effect on HF signals, which can prevent them from reaching the F2 layer of the ionosphere. This means that predictions created by a program like VOACAP or ITURHFPROP can often be […]
