Hi Jean-Louis, and Walter. I see a rapid almost cyclical fading on some
136kHz signals immediately after a geomagnetic storm (we have had several
minor storms Kp=5 recently), the period usually lengthens on successive
nights. I have suggested that this might be due to the plasma cloud
"slapping" the ionosphere on one side and it then "ringing" like a wobbly
jelly ( I must have eaten too much this Christmas !!) This would cause the
"reflection" level to move up and down a few hundreds of metres maybe even a
kilometre, which is quite sufficient to swing through a 180degree phase
change. The movement required for a "null" at 440kHz is much less than at
136kHz. I would certainly be interested to see if the period of the fades
increases over the course of the next few nights.
Cheers de Alan G3NYK
alan.melia(at)btinternet.com
----- Original Message -----
From: <[email protected]>
To: <[email protected]>
Sent: 04 January 2005 13:48
Subject: LF: RE: Re: DI2AG 440KHz
Walter et al.
I recorded your DI2AG sigs last night from 6 PM to 6 AM .
A quick exam on the 150 ARGO snapshots during my tea time early this
morning tend to show a deep QSB (period around 1 minute).
Have you got other similar remarks ?
73
Jean-Louis F6AGR
Loc. JN18DQ, near Paris
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