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Propagation News – 19 August 2018Fri 17th Aug 2018 14:27 BST

Matter from a solar coronal hole sent the K-index to four on two occasions last week. This adversely affected the ionosphere and on Thursday morning the maximum usable frequency over 3,000 kilometres was struggling to get much above 10MHz. Earlier in the week conditions had been much better. In fact, there were signs we are […]

Propagation News – 12 August 2018Fri 10th Aug 2018 15:17 BST

The Sun remained spotless this week as the solar flux index stuck resolutely around the 70 mark. The tiny sunspot that made an appearance on the first of August didn’t come to much and had vanished by the third. This underlines that we must be getting closer to sunspot minimum, although don’t expect to see […]

Propagation News – 5 August 2018Fri 3rd Aug 2018 15:43 BST

The solar flux index stayed around the 70 mark last week, although a new tiny sunspot did become visible on Tuesday. Unfortunately this had little real effect on the SFI, although it did push the sunspot number to 11. This can be misleading due to the way sunspot numbers are calculated. You score 10 for […]

Propagation News – 29 July 2018Fri 27th Jul 2018 15:32 BST

The solar flux index hit 66 on Thursday 26th, which is probably the lowest it will go this sunspot minimum. At the time of writing the visible solar disk has been devoid of sunspots since 27 June, apart from the tiniest fleck that sent the sunspot number to 11 for one day on 12 July. […]

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