=3B
=3B
thanks M= arkus/Alan
=3B
Yes there was a delay and some warbling/echo - ci= rcuit was at 9MHz (so this is OT here !) from 8305N 7406W =3B to 6734S = 6808W - I was "gob smacked" at the time at the signal strength and thought = it was chordal (duct) =3Bin nature but Magnetoducting sounds more like = it (and nice word too!)
=3B
I had just =3Bone LDE experience= during =3Bmy =3Btrips to Antarctica=2C this was "in the summer of = 79" (theres a song in there some where) =3BI think - =3B- one was= on nearly 4MHz circuit =3Bbetween 6734S =3B 6808W and 5140S 5920 W= (appx) =3B- voice SSB circuit with up to =3B2.5 secs delay=2C so n= ot normally a long path- =3BI believe the K was 4 to 5 that day - but s= hould have the records somewhere as I was stationed =3Bclose by one of = our Ionosounders (the Beast <=3Bbuilt in Croydon in South London by the w= ay>=3B as it was called with a few QQV0640A finals driven to square waves= !).
=3B
1979/80 F2Fo during the heat of the day and when not dis= turbed meant we could watch (with difficulty) Nationwide and Tomorrows worl= d on BBC1 405 lines 45MHz from 16=2C000Kms away - blew people away! Good ol= d Black and White TV I shipped down -
=3B
My first launch is th= wart with difficulties and not just iono - :-) =3B
=3B
&nbs= p=3B
Cheers

=3B
=3B
=3B
WE2XPQ =3Bis = on 475kHz CW Ground wave profiling thru the day here in Alaska - 150W TPO t= o offset Marconi =3B- off at dusk
=3B

=3B

<= hr id=3D"stopSpelling">From: markusvester@aol.com
To: rsgb_lf_group@blac= ksheep.org
Date: Tue=2C 24 Mar 2015 21:10:57 +0100
Subject: Re: LF: R= e: Re: Poor conditions - the return of skywave

=0A= =0A= =0A= =0A= =0A= =0A= =0A=

Hi Laurence=2C

=0A=

=3B

=0A=

interesting! =3BLike Alan=2C I've&= nbsp=3Bwondered =0A= whether your N-S polar communication could have been through a field-aligne= d =0A= magnetospheric duct =3B(referenced eg. by

=0A=

http://www.resear= chgate.net/publication/257362707_The_magnetospheric_echo_box_--_A_type_of_l= ong-delayed_echo_explained =0A= or http:= //folk.uio.no/sverre/papers/2009_MagnetoDucting-QST-LA3ZA.pdf=2C or = in an article by Peter =0A= Martinez =3Bin Radcom Oct 2007). Wonder if =0A= you =3Bhappened to =3Bfind an unsusual delay =3B- it could be m= ore than =0A= half a second=2C so maybe =3Bjust noticable in a voice circuit.<= /div>=0A=

=3B

=0A=

Best 73=2C

=0A=

Markus (DF6NM)

=0A=

=3B

=0A=

From: Alan Melia

=0A=

Sent: Tuesday=2C March 24=2C 2015 6:16 PM

=0A=

To: rsgb_lf_group@blacksheep.org =0A=

=0A=

Subject: LF: Re: Re: Poor conditions - the return of =0A= skywave

=0A=

Hi Laurence you dont say what frequenc= y the pole to =0A= pole path was? I wonder whether it might have been a sort of duct (trough i= ts =0A= sometimes called) above the D-layer. The auroral hole might even help the = =0A= signals into it :-)) =3BTop band is supposed to exhibit that mode some= times. =0A= Otherwise maybe a similar mode to whistler transmission=2C though your freq= uency =0A= might be too high for that.....the duct seems favourite.

=0A=

=3B

=0A=

The inside the auroral ring events sug= gest the =0A= precipitation is occuring at the latitude of the aurora=2C and this spreads= out as =0A= it diffuses south. Hence its not quite so bad in Vancouver. I reckon your = =0A= problem is launching that first hop through that.

=0A=

=3B

=0A=

It is not over yet=2C the Dst has star= ted to dip =0A= again (Kyoto has gone up) I think this is the precursor to another coronal = hole =0A= flow predicted for the 25th. I doesnt look too bad on the animation =3B= but it =0A= will add some electrons to the ring current and drag out the recovery a =0A= bit.

=0A=

=3B

=0A=

Alan

=0A=

G3NYK

=0A=

=3B

=0A=

=0A=
----- Original Message -----
=0A=
From: =0A= Laurence KL7 L
=0A=
To: rsgb_lf_group@blacksheep.org = =0A=
=0A=
Sent: Tuesday=2C March 24=2C 2015 3:30 =0A= PM
=0A=
Subject: LF: Re: Poor conditions - the =0A= return of skywave
=0A=

=0A=
Thanks Alan - it certainly was a kicker up here - =0A=
=3B
Last night I had my first decode on 475kHz from WH2XGP si= nce =0A= 17th from the "vanished" band =3B- so this shows a slight improvement= - very =0A= slight.
=3B
Its amazing to me that such relatively small chan= ges in =0A= latitude have close to a logarithmic effect in losses. Its a different wo= rld =0A= here at 61N to my friends in Seattle just a 3 hour flight South=2C but ag= ain=2C =0A= and specific to this location - =3Bthese local and not so local ragg= ed =0A= mountain ranges are breaking up skywave reflections too to my =0A= detriment=2C =3Bprobably for signal coming in below 10 degrees here&n= bsp=3B- and =0A= that's not helping at all either. I actually think this lat/geolat is act= ually =0A= worse than than up near the Geo Pole -
=3B
Base on our Fienne= s =0A= expedition comms work =3BIm still of an opinion that LF/MF =3Bco= mms =0A= between stations inside the disturbed Auroral oval are typically =3Ba= ctually =0A= way way better than on =3B the South side of it or in it during a Mag= /proton =0A= event =3B- =3B =3B and often we sat there pondering - and cam= e to the =0A= conclusion it was =3B =3Blike being in a one way semi conductor m= irror or =0A= gold fish bowl with a very low noise level able to hear the world but the= =0A= world not hearing us across the Oval . During the March 13th 1989 event = =0A= another North Pole expedition hadn't been able to contact their Spitzberg= en =0A= base and we were asked to look out for them at Ward Hunt =3Bon 2182kH= z as =0A= part of the SAR =3B- so I put out a few calls and there they were at = =0A= S7 =3B - them using 5W to a small wire and good earth - signals were = so =0A= stable with nearly no fade at some 1400Kms in a twilight period and all w= ithin =0A= this goldfish bowl - I actually had to tell them to reduce power as their= =0A= batteries were so dead they were FMing..
=3B
The other oddity= was =0A= the excellent North =3B Pole to South Pole HF comms during the latter= half =0A= of that event - we couldnt talk to Resolute or Eureka down the road=2C bu= t could =0A= swap Met and Sitreps to South Georgia and Rothera bases at huge signals o= n =0A= what appeared chordal =3Bhop - what an oddity that was - once the ion= o =0A= recovered a bit we lost this path....
=3B
thanks for the input= - roll =0A= out the "quiet sun" please.
=3B
Laurence KL7L =0A=
=3B
=3B
=0A=
=0A=
=0A= From: alan.melia@btinternet.com
To: rsgb_lf_group@blacksheep.org
Da= te: =0A= Mon=2C 23 Mar 2015 18:42:00 +0000
Subject: LF: Re: Poor conditions
=
=0A= =0A= =0A=
Hi Laurence and Roelof=2C Yes that w= as a big one on =0A= the 17th. I dont remember the Dst being depressed to -230nT for some quit= e =0A= long time. My thumbnail estimate says that it could take at least 14 days= and =0A= possibly up to 21 days to really get back to to good conditions again. Th= e =0A= succession of shocks really loaded up the ring current=2C and although th= e Dst =0A= has risen to -35nT its rate of increase has flattened out.
= =0A=
Because the CME "snow-ploughed" it w= ay though a =0A= coronal hole high speed stream the event produced a large multiple proton= =0A= event which has died away now=2C but the PCA effects tend to linger. We a= re =0A= still gettting shocks (Kp 6 yesterday and Kp=3D5 today) =3Bwhich may = be =0A= "sub-storms". These =3Boccur when ions and electrons trapped in the = =0A= mageto-tail are "spat back" towards Earth (another glob of plasma is spat= in =0A= the opposite direction to conserve momentum) The mechanism is much like h= e =0A= release of energy from the strained Solar magnetic field that produced th= e =0A= CME. The trapped hot electrons "wind up" the field in the magneto-tail un= til =0A= it "snaps" into a lower energy state. The lost energy is carried by the = =0A= ejected particles.
=0A=
=3B
=0A=
Alan
=0A=
G3NYK =3B

= --_c7d08ed2-97dd-4a6a-a3d2-28ebc28fc177_--