RSSGB2RS Propagation News

Propagation News – 25 July 2021

| July 23, 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, […]

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Propagation News – 18 July 2021

| July 16, 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 […]

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Propagation News – 11 July 2021

| July 9, 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 […]

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Propagation News – 4 July 2021

| July 2, 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 […]

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Propagation News – 27 June 2021

| June 25, 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 […]

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Propagation News – 20 June 2021

| June 18, 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. […]

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