
By Courtesy of the Propagation team




G3YLA JIM

G0KYA STEVE

G4BAO JOHN
Its all about the weather

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Pictured :
Jim Bacon G3YLA
NARC club member
and Nick Henwood
RSGB President.

Propogation News
7th August 2026
HF

3
The Sun was mostly settled last week with very little to report.
The solar flux index declined to 108 by Thursday 6th August, with most of the sunspot activity being on one half of the solar surface. Geomagnetic conditions have also been settled with a Kp index mostly below three for the past few days.
A coronal mass ejection impacted the Earth and pushed the Kp index to 5.67 on August 2nd, but conditions recovered within 24 hours.
We’ve even been almost solar flare free, with only seven minor C-class events over the past three days.
So this all bodes well for HF propagation, although the Dourbes Digisonde shows the MUF over a 3,000km path topping out at around 21-23MHz at midday.
So 24 and 28MHz are mostly only open to Sporadic E. Some multi-hop paths are still opening up to the Far East especially, so don’t write 10 metres off, even if you do have to listen to noise for a lot of the day! F2-layer propagation still favours North-South paths on 10m.
Next week DX to be worked includes E51KEE (Cook Islands), YS/WE9G (El Salvador), UK/SP9DLM (Uzbekistan), and OX3LX (Greenland). Later in the week look for A50QO (Bhutan), J68TT (St Lucia) and OJ0JR and OJ0YL (Market Reef).
NOAA predicts that next week the Sun will remain pretty calm with an SFI in the range 105-110. The Kp index is forecast to be mostly 2-3, so conditions should remain fair, but not disrupted.
And don’t forget the solar eclipse on Wednesday 12th August. RSGB has lots of activities planned including two HF contests, WSPR activity and medium/long wave monitoring – see the latest RadCom for details.
VHF and up

The main theme of the weather during the coming week is one of some settled high-pressure weather with Tropo options, especially early next week.
This is likely to be interrupted by occasional periods of low pressure with rain for northern western parts. The summer weather patterns typically produce a more showery type of rain, even from fronts, giving a reasonable chance of rain scatter, although activity may be small in the south and east. Of the two modes mentioned above, next week will probably be more biased towards Tropo than rain scatter.
The Kp index made a brief excursion to Kp=5 last week, but seems a bit quieter now, although it’s a reminder to check now and again in case we find some radio aurora off the back of it.
The meteor scatter options feature strongly this week as the Perseids meteor shower peaks around 12th/13th August. It’s quite interesting to just leave a receiver on an MS calling channel to hear the transient signals.
The Sporadic-E season continues and since meteor debris plays a role in providing the ionisation required for Es, the Perseids week is always worth checking for a surprise opening. In terms of jet stream weather patterns, the stronger hints come from looking east towards the Baltic, but other directions are not to be ignored since even quite small features like a slow-moving severe thunderstorm can have an influence.
For EME operators, Moon declination reaches maximum on Sunday 9th when Moon window length and peak Moon elevation reach maximum. Path losses are at their lowest at perigee on August 10th. 144 MHz sky noise is low to moderate until the 12th when the Sun is close to the Moon in the sky due to the partial eclipse that day.
G3YLA JIM


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