Hello Alan and all ,
Very beautiful explanation, thank you. If you look at the Capt_06
capture ( http://jpmere.online.fr/Temp/ ) one the increase of noise
between 03:30 and 05:30 sees very well (the lines of LORAN disappear! )
On the Plot_06 stud it is even more visible! Explanation of the scale in
dB: -5dB = average Noise of day; 0dB = average noise of night; the scale
is precise with a margin of 0.2 dB.
Jean-Pierre f1afj
Alan Melia a écrit :
Hi John I did have static type interference here much worse that earlier in
the week. I have the characteristic vertical streaks.....the levels may have
been more continuous with Jean-Pierre. Extra-terrestrial noise would not be
able to penetrate the ionosphere, and there doesnt seem to be much auroral
activity at present. It could of course be "favourable fading", only in this
case favouring maybe eastern European noise source propagation. Signals here
were down but I only started captures about 0100z.
There is a sign in Steve's plot, if you remove the 0700 peak, that levels
were dropping steadily from about 0330z. This effect is confirmed by
Laurence. I wonder if this just means that the Ring Current is not depleted
of electrons yet and is still exchanging them with the D-layer. The storm
that started it all was cited as "severe" (Kp=8) and we have seen in
previous years a storm of that magnitude delay propagation recovery by
upwards of 28 days. What was a surprise was the relatively shallow dip in
Dst it produced (only down to -160nT, when we could quite easily have
expented -300nT) and then the very rapid initial "recovery".
I do not have the expertise to pontificate on this but I am wondering
whether, because there are several "orbits" in the Ring Current, these
severe storms populate the outer (higher energy?) ones more heavily and
these electrons take longer to decay to an energy where they can be
precipitated. It is undoubtedly much more complex than that (it always is
!!).....but it makes a good simple story !!
Thanks to all for all the data and reports without which, it would be
impossible to concoct these "off the wall" theories.....even if they are
hopelessy incorrect it is great fun !
Cheers de Alan G3NYK
----- Original Message -----
From: John Andrews <[email protected]>
To: <[email protected]>
Sent: 10 January 2007 11:58
Subject: Re: LF: Re: T/A last night :onlly a few traces XES
Jean-Pierre, Jay,
XES did not go on the air until 0305 UTC last night. I am puzzled as to
why conditions were so poor for both stations. It will be interesting to
see Hartmut's report.
John Andrews
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