Nowadays in Scandinavia we are able to monitor 10/15m FT8 frequencies to see
if the path is open. So having your WSJT-X on is handy.
Path also varies: it is more frequently the northern thing - SM2/OH8/OH9 the
path is usually more often open and in the south OH1/OH2 openings are often
shorter. Usually Baltic countries are already too much in the south.
On stateside end path also varies: the most common is probably West Coast
propagation but sometimes we are able to work only EastCoast! When
propagation during the sunspot max. is sweet, we are able work both NA and
JA over the pole at 21-23Z, even on 10m!
Mechanism is unknown to me but clearly aurora usually "gives a boost" to
this path.
73 Timo OH1NOA OH1NA (one of OH1F gang)
> -----Original Message-----
> From: CQ-Contest <cq-contest-
> bounces+timo.klimoff=dnainternet.net@contesting.com> On Behalf Of K9MA
> Sent: Monday, January 31, 2022 4:03 AM
> To: cq-contest@contesting.com
> Subject: Re: [CQ-Contest] Scandanvian propagation question
>
> 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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>
> --
> Scott K9MA
>
> k9ma@sdellington.us
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