
By Courtesy of the Propagation team




G3YLA JIM

G0KYA STEVE

G4BAO JOHN
Its all about the weather

Link : Windy.com
Live Weather Reports



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

Propogation News
31st October 2025
HF

3
Last weekend saw HF shine as stations took part in CQ Worldwide SSB. Geomagnetic conditions remained settled and DX was aplenty, with contacts possible as far afield as Alaska to the west and China to the east.
Given the unsettled conditions we have had recently, it was a welcome break as radio amateurs filled their logs with far-flung DX.
As we enter November, we can still expect the fine Autumnal conditions that made October so good, but as the month progresses, we can also anticipate improvements in LF band DX. So keep an eye on 40 and 80 metres.
The solar flux index has declined somewhat and is now standing at 118. This is still enough to get 10 metres humming, but it is a far cry from the 200-plus we saw at sunspot maximum. Nevertheless, get on the bands and work the DX while you can.
Two large coronal holes, one in the Sun’s northern hemisphere and one in the south, have been the sources of a fast solar wind stream, and we may expect more geomagnetic disturbances this weekend.
Also, active region 4246 is now coming around the Sun’s limb again and could be worth keeping an eye on. It has been emitting solar flares while behind the Sun, so look out for more activity upon its return.
Next week NOAA predicts that the SFI could increase, perhaps starting the week at around 135 and increasing to 150 by the ninth.
The first half of the week should be quiet geomagnetically, but we may expect more unsettled geomagnetic conditions around the seventh to the ninth, when the Kp index could increase to five. Expect maximum usable frequencies to be depressed until the Kp index recovers.
VHF and up

The current spell of unsettled weather remains the focus for the foreseeable future. Previous model runs had suggested the possibility of high pressure returning by the end of next week, but this is no longer the case.
In this first weekend, the 144MHz CW contest 1400-1400hrs UTC Saturday to Sunday looks to be under the influence of low pressure rather than any Tropo-producing highs. With the unsettled pattern continuing, the optional modes might be rain scatter for the GHz bands, but not Tropo.
The chances of aurora are there, and after a very auroral-sounding 40m this evening (Wednesday, October 29th) when the Kp hit four, we should remain alert to changed conditions on the high HF and VHF bands, although it probably needs something higher, like Kp=5-7, to be worth getting excited about for radio effects.
The meteor scatter options look reasonable as we move into November, but the next important shower, the Leonids, doesn’t peak until mid-month on the 17th, although we enter the edge of the stream later next week.
A final note of caution is that this unsettled type of weather pattern can produce rapidly-developing lows and bring damaging winds to some parts of the country, so take the opportunity on the quieter days to check antennas are secure.
For EME operators, the Moon’s declination is negative and rising, going positive on Sunday, November 2nd, so Moon window lengths and peak elevation are both rising. Path losses are still falling as we approach perigee on the fifth. 144 MHz sky noise is low all week, rising to medium by next weekend.
G3YLA JIM


Please read
user notes on website.

G0KYA STEVE
Communications and PR for hi-tech and aerospace companies
STEVE 's Beacon List
G3USF's Worldwide List of HF Beacons
G3USF's Worldwide List Of 50MHz Beacons


Understanding Solar Indices


