Re: LF: No TA on MF :-(

[Stefan Schäfer <Stefan.Schaefer@iup.uni-heidelberg.de>]

Hi Roelof,

Thanks, most interesting!
And, last night the local (2000 km range) MF propagation was excellent, 
really a difference. We were isolated from far QRN due to the bad DX 
propagation :-)
73, Stefan

Am 03.10.2013 20:00, schrieb Roelof Bakker:
> Hello Stefan,
>
> I study propagation of Canadian NDB's in the range 200 - 520 kHz by 
> means of a PERSEUS spectrum recoding from 200 - 600 kHz. This 
> recording runs every night.
> The Kyoto Dst has been well above zero for the last couple of weeks 
> and peaked at 41 on 03:00 UTC on October 2.
> It than made a steep dive and bottomed up at just below -40 at 11:00 UTC.
>
> It was found that propagation from Canada ceased completely over the 
> 200 - 500 kHz frequency range, starting at 03:00 UTC on October 2. 
> This is way before the Dst passed the critical level of -20 which has 
> been found before.
> I gather that the speed of the change is related to the sudden drop out.
>
> It was if someone had pulled a switch!
>
> 73,
> Roelof, pa0rdt