GB2RS Propagation News
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 […]
Propagation News – 20 June 2021
A large coronal hole returned last week and started to become Earth-facing on Monday the 14th. The high-speed solar wind stream from the hole impacted the Earth on Tuesday evening, pushing the Kp index to five. Luckily, conditions returned to normal by late Wednesday and the Kp index was down to two or three thereafter. […]
Propagation News – 13 June 2021
The predicted geomagnetic disturbance we spoke about last week didn’t amount to much. The Kp index rose to four on Monday evening, but the disturbance was short-lived and it was back to one later on Tuesday. Region 2829 was the only sunspot group visible on the Sun later in the week. This pushed the solar […]
Propagation News – 6 June 2021
The Sun was pretty quiet over the last week, with few sunspots and a solar flux index in the mid-70s. From a peak of 82 on Sunday, the SFI declined to 75 on Thursday when there were just two small sunspot groups visible, regions 2827 and 2929. As predicted, geomagnetic conditions have been mostly settled, […]
