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G3YLA JIM

G0KYA STEVE

G4BAO JOHN
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Jim Bacon G3YLA
NARC club member
and Nick Henwood
RSGB President.

Propogation News
19th June 2026
HF

3
We had a quiet week geomagnetically, but the solar flux has also declined.
Over the past week the Kp index never rose above two or three, with only one three-hour excursion to five on June 11th. This bodes well for HF propagation, but the SFI has declined from its recent high of 148 on the fourth to be in the 110-120 range over the past few days.
As a result the Sun is looking a little sparse when it comes to sunspots. This, coupled with the summer doldrums, has seen MUFs drop and any DX has been limited to 21MHz and below. Ten metres has been mainly open to Sporadic E, with some multi-hop openings giving the appearance of F2-region propagation at times.
DX to be worked over the coming week includes D44EC (Cape Verde), PJ2/PH2M (Curacao), 3G0YM (Easter Island), and the final days of FS/K9EL (St Martin), 5R8EC (Madagascar) and OX3LX (Greenland).
Next week, NOAA predicts that the SFI may increase slightly to be in the range 130-140, although this will need some new additional sunspots. Geomagnetic conditions are forecast to be quiet with a maximum Kp index of two. We may see a slight upturn on June 23, when the Kp index is predicted to rise to four, mainly due to an enhanced solar wind.
To recap, Summer is a time when paradoxically daytime MUFs tend to be lower than in autumn and winter, However, nighttime MUFs can be higher, with the potential for 30m and 20m to be open all night. ARRL Field Day will run from 1800hrs UTC on June 27 to 2100hrs UTC on June 28, so that may be an opportunity to work some U.S. portable stations who will be very pleased to contact you.
VHF and up

The weather models are a bit undecided about how the coming week will evolve. One option is for predominantly high pressure and a chance of some summer Tropo, which may persist over the sea, but is limited inland by daytime heating.
Tropo operators should focus on nighttime conditions, unless located right on the coasts. The other version suggests that low pressure will probably win out over northern areas and occasionally in the south, so that is the rain scatter world and it would need some heavy thundery showers to get the best results.
High summer is not the best for aurora and the Kp index ideally needs to be at least above Kp=5 before we can get excited about radio aurora.
Meteor scatter has been making use of the decaying Arietids from earlier in June, but we now enter the window of activity (22nd June to 2nd July) for the second shower of interest this month, the June Bootids, which peak on June 27th – they are not a huge rate, but may bring some radio interest.
The Sporadic-E season is progressing with most days offering something from the 10m and 6m bands within Europe, but a somewhat limited response on 2m. As usual digital modes will be the first to see results, so use the FT8 paths as a guide for the other modes which should follow as the Es intensifies.
Multi-hop paths do happen regularly, but require beams and a lot of luck for several Es patches to align, which means the best policy will be listening at the right time – this is in the morning for the paths to the Far East and in the evening for those to the States and Caribbean.
EME now, and Moon declination is decreasing again, going negative on Sunday with path losses rising now the Moon is past perigee. This means shortening Moon windows and lower peak Moon elevation as the week progresses. 144 MHz sky temperature is low, rising to moderate by Friday the 26th.
G3YLA JIM


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