Thanks for these references on magnetospheric ducting. Looks like as good an
explanation as any I've seen (and better than most).
Art Delibert, KB3FJO
From: Topband on behalf of Andy Cook
Sent: Monday,
Greetings All
Back in the late '70s I experienced some long duration echoes on 80-meters SSB.
I had been burning the candle at both ends DXing at my pre-sunrise and late
after dark for a few days and was falling asleep at the "mic".
I found myself getting teed-off by someone CQing on the freq
This is interesting.
I recall a discussion here about very long LDEs awhile back. IIRC, it was
suggested that perhaps the magnetosphere and the Van Allen belts might be
involved, rather than the much closer ionosphere.
I heard a double echo on 75m last year. I heard his direct signal which was
I experienced long delayed CW echos once on 20m, back in the 1980s
before there was much wireless stuff. Also, I lived in the country with
no close neighbors. The delay was significant because I was not using
instant break-in, with the rig taking at least 1/4 sec to switch to
receive. I
I had a friend (VE7BLF) many years ago who noted the same thing on 160m,
with his 'night before' CW CQ's being heard 24 hours later! The signals were
somewhat watery and not very stable...rather tortured sounding as if they
had been to hell and back. The mystery continued for a few years but
Nowadays we have a huge amount of RF repeaters in use for several services,
like , Wi-Fi , LTE4, Data links. Microwave links, FM stations link, TV video
links.
All these systems has a receiver and a transmitter. The intermediated
frequency used can be close to few MHz depending the services.
In the mid -80's while living in Seattle ,WA I experienced extremely
strong LDE signals on 160M while in a SSB ragchew with locals on
~1860kHz. Unfortunately I lost the tape in my move to the SW US. The
delays were approximately 1 sec and were only heard within a radius of
about 50 miles.
A
Bruce K1FZ said: "I have noticed that there appears to be a link between
the start of an aurora and long path 160 meter openings."
Others have noted this interesting effect. The only physical tie between
the two that I'm aware of is that a spike in the K index can initially
improve the electron
Andy,
There was a passenger on an airliner that took photographs of a very large
Aurora at that time. . One of the photographs was shown on TV -ABC World
News.
It is likely that the Aurora sparked all these events.
I have noticed that there appears to be a link between the start of
I think this form of ducting takes place way above the layers of the atmosphere
where weather happens. In my experience the magnetospheric ducting is normally
localized in impact. If this was really happening in multiple places around the
world at the same time on this occasion then I think
Hi Andy,
Ducting takes place over a relatively small area. Depends upon cloud layers
and temperature zones
This event took place ~ world wide. Band openings between North America to
Asia, and Australia.
73
Bruce-k1fz
http://www.qsl.net/k1fz/beverage_antenna.html
On Mon, 6 Feb
I think you'll find this was Magnetospheric Ducting. Take a look at some of the
articles here http://la3za.blogspot.co.uk/search/label/Unusual%20Propagation
and here http://folk.uio.no/sverre/papers/2009_MagnetoDucting-QST-LA3ZA.pdf.
Delay depends on your latitude - but couple of hundred
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