Re: [CQ-Contest] Scandanvian propagation question

[Courtney Judd <k4wi@k4wi.net>]

I can answer this one for sure... I am located west central Alabama 
(32.4/-87.6 ... EM62ef) and working Scandinavia on 10 meters my late 
afternoon their darkness was part of my contest game plan. There would 
always be 20 or more to work... easy points/mults! Then there was the 
very early morning 0900 opening long path to JA/far east over South 
Africa and noon openings to VU2. One Sunday afternoon I could pick out a 
very faint Q7 calling me.... finally swung the top antenna straight 
south over Antarctica  and there was 8Q7 calling me! I sure do miss my 
10 mtr stack... 7/7/7/7... the tornadoes that swept thru Alabama in 2011 
took it down.... 73's Cort K4WI
K9MA wrote on 1/30/2022 8:03 PM:
> I don't know the exact propagation mechanism, but this path from far 
> northern EU to the northern US is very often open. We may experience 
> it more often here in the north-central US, because our geomagnetic 
> latitude is close to that of southern Scandinavia, and at least 10 
> degrees higher than our geographic latitude. The openings happen in 
> the winter, long after the band has gone dead to the rest of EU. It 
> even happens on 10 meters in high sunspot years.
> I don't know how much further south it extends in NA. May Jukka can 
> tell us.
> 73,
> Scott K9MA
>
>
>
> On 1/30/2022 2:43 PM, Jukka Klemola wrote:
> > John,
> > You ask for wisdom "does anyone know of the propagation mechanism to
> > explain this"
> >
> > Simple answer is, living here in Scandivnavia, been on the bands from
> > 1982, all I can tell is the Queen Aurora shakes her skirt so every now
> > and then there is some dust or glitter that opens up the path.
> >
> > It is 'rather typical' the path is there, but it is more typical the
> > areas at each end are small.
> > That is, the opening must be from an area to an area there are
> > stations and then the stations must be on.
> >
> > Then the most difficult part:
> > At least one of the stations must call CQ so the other has the rare
> > opportunity to answer the CQing station.
> >
> > The enigma in this is how often there are stations calling CQ to a
> > completely empty band?
> > Well .. sometimes the rag-chewers reveal the opening.
> >
> > Against many possible odds, we do encounter these openings every now 
> > and then.
> > Typical Old Timer answer at local clubs here is that this propagation
> > happens only during contests. This propagation does not exist outside
> > countest hours.
> >
> > Reckon that is not the whole truth. There is more to it.
> >
> > We can analyze SFI, solar wind parameters, K or A figures ...
> > Yeap. You guessed right.
> >
> >
> > 73,
> > Jukka OH6LI
> >
> >
> > su 30. tammik. 2022 klo 22.28 John Geiger (af5cc2@gmail.com) kirjoitti:
> > > Something I have noticed during the ARRL DX contest, and other winter
> > > contests, as well as during casual DXing, maybe a LA/SM/OH contester 
> > > will
> > > have a better explanation for this:
> > >
> > > This past Friday I worked a SM3 on 15m FT8 at 5:15pm local time 
> > > (2315 UTC),
> > > well past the time that the path to Europe on 15 had closed.  This 
> > > isn't
> > > the first time I have had this occur.  Over the past few years I have
> > > witnessed this before, stations from LA/SM/OH coming through on 15 
> > > and 17
> > > meters mid to late afternoon, several hours after the path to Europe 
> > > had
> > > closed for that band.  They haven't been coming in the whole time 
> > > since the
> > > disappearance of the rest of Europe, it is like a new path opens up 
> > > several
> > > hours later, but only to these regions.  These areas in Europe will 
> > > have
> > > been in darkness for several hours as well, dropping the MUF below 
> > > 15 and
> > > 17 meters, but there they are.
> > >
> > > This is a winter phenomena I am discussing.  I am very familiar with 
> > > Europe
> > > coming in later at night on 15 and 17 during the summer months, 
> > > especially
> > > during higher sunspot numbers.
> > >
> > > So does anyone know of the propagation mechanism to explain this-why 
> > > this
> > > one part of Europe comes in several hours after the path to the rest of
> > > Europe has closed-and when it is well into darkness at their QTH?  I am
> > > guessing it might have something to do with their location in the 
> > > Auroral
> > > Zone and some sort of Aurora to F2 hookup, but that is just a guess.
> > >
> > > 73 John AF5CC
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