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Re: Topband: Echo on 160m yesterday morning

To:, Topband <>
Subject: Re: Topband: Echo on 160m yesterday morning
From: "K1FZ-Bruce" <>
Date: Mon, 06 Feb 2017 09:54:34 -0500
List-post: <">>

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 

It is likely that the Aurora sparked all these events.

I have noticed that there appears to be a link between the start of an aurora 
and long path 160 meter openings.

73,  DX,


 On Mon, 6 Feb 2017 14:42:58 +0000, Andy Cook  wrote:

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 that is unusual.

Andy, G4PIQ

-----Original Message-----
From: "K1FZ-Bruce" 
Sent: ‎06/‎02/‎2017 13:46
To: "" ; "Topband" 
Subject: Fwd:  Echo on 160m yesterday morning


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.


 On Mon, 6 Feb 2017 12:20:07 +0000 (GMT), Andy Cook  wrote:

I think you'll find this was Magnetospheric Ducting. Take a look at some of the 
articles here 
and here 
Delay depends on your latitude - but couple of hundred millseconds is about 
right and this is a peak time of year for the effect. 
I've heard this quite frequently on 80m around mid local-evening during the 
winter, and one occasion - on 3rd Feb last year - very strongly indeed. That 
night I was able to hear my echoes with just 25mW into a dipole on 80m - but 
it's often strong enough to be audible with a few watts. I've read papers which 
suggested it does also occur on 160m.
Reports of these being less strong / gone when you switch to a vertical look 
plausible as well since they apear to require vertical incidence from the 
Andy, G4PIQ 
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