Propagation news

Propagation news and other items:

First of all the spaceweather report, then scroll down for the RSGB's GB2RS weekly propagation report and other information.

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This page was updated 2017 November 22nd  09:40  UTC.

The following data is from the Space Weather Prediction Centre:

Geophysical Alert Message wwv.txt

Issued 2017 November 22 0900 UTC

Solar-terrestrial indices for November 21st follow.

Solar flux 73 and estimated planetary A-index 28.
The estimated planetary K-index at 0900 UTC on 22 November was 2.

No space weather storms were observed for the past 24 hours.

No space weather storms are predicted the next 24 hours.

 

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Solar Region Summary (Sunspots visible on the solar disc)

Issued 2017 November 22nd 0030z

Regions with Sunspots.  Locations valid at November 21/2400z

Region Number.........Location...........Area..........Mag Type

None.......................xxxxxx.............xxxx.............xxxxx

xxxx.......................xxxxxx............xxxx............xxxx

xxxx......................xxxxxx.............xxxx...........xxxx

Data courtesy of the Space Weather Prediction Centre

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Here is the GB2RS radio propagation report broadcast on Sunday, September 10th compiled by G0KYA, G3YLA and G4BAO on Friday 8th September, shown here by courtesy of the RSGB and their Propagation Studies Committee.

Last week the sun caught everyone out. While NOAA predicted the solar flux index would be in the mid 70s, the sudden appearance of a large number of sunspots pushed it up to 183 on Tuesday, although it had calmed down to 122 by Wednesday.

This had a major impact on the bands with openings up to 10 metres being reported.

To be fair to NOAA, these spots were only just appearing around the edge of the sun as last week’s report was being prepared.

Unfortunately, this new sunspot activity also resulted in numerous X-class solar flares, their associated coronal mass ejections and a proton storm. The K index was pushed up to five on Tuesday, and four on Wednesday and Thursday, impacting HF conditions adversely.

Next week the larger spots will have rotated off the sun’s visible surface, so the question is, what will follow them?

At the time of writing it looks like the Sun may calm down a little, although there is evidence of some new spots growing. NOAA predicts the solar flux index may decline into the 80s or 90s by the end of the week with unsettled geomagnetic conditions from around the 13th to the 17th.

The good news is that each week we edge closer to better autumnal HF propagation, so expect higher maximum usable frequencies and better DX.

October should be even better, so make sure your antennas are ready.

 

And now the VHF and up propagation news.

After last week’s class X9.3 solar flare, keep your beams to the North and look for any auroral propagation on six, four and two metres.

The big sunspot group will have rotated off the sun’s visible surface by now, but, as we said, it may not be the last one we see during this period.

The 2017 Sporadic E season struggled into the first week of September, but we sense we must be near the end now.

That leaves Tropo as the next best option for some DX at VHF.

Unfortunately, for much of the next week, the UK weather pattern is dominated by low pressure, bringing unsettled and windy weather - so that also looks like a non-runner.

Such changeable weather, often showery, may produce some rain scatter on the GHz bands, otherwise it's thin pickings for weather-related propagation modes.

With only minor meteor showers this week, continue to look around dawn for the best random meteor scatter contacts.

We have positive Moon declination all this week. So, combined with low losses as we approach perigee on Wednesday, it’s a good week for EME with long morning and daytime Moon windows.

And that’s all from the propagation team this week.

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Here is the GB2RS radio propagation report broadcast on Sunday, September 3rd compiled by G0KYA, G3YLA and G4BAO on Friday 1st September, shown here by courtesy of the RSGB and their Propagation Studies Committee.

And that’s all from the propagation team this week.

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The GB2RS radio propagation report for broadcast on Sunday, August 27th

Now the radio propagation report, compiled by G0KYA, G3YLA and G4BAO on Friday 25th August.

 

And that’s all from the propagation team this week.

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Here is a link to a YouTube video showing some of the work of the SWPC: https://www.youtube.com/watch?list=UU9hQvMjzSxurMirYDgOMezw&v=JncTCE2NWgc

 

GB3WES beacon 5,290 kHz.

 

StratWarm - stratospheric warming. Does it have an effect on HF propagatiion? If it creates turbulence in the ionosphere and stirs the electron distribution, then surely it does.

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