[Lf] lf propagation

[Andre' Kesteloot]

Väinö Lehtoranta wrote:

> The behavior of propagation conditions on low
> frequency bands is a function of qth, latitude,
> etc. In our case almost any amount of extra hard
> x-ray precipitation to the D-region, which is what
> happens during certain flares, ruins low frequency
> conditions here. Our main MF test stations have been
> Norwegian Kvitsoy 1314 kHz and Kemi NDB 373 kHz.
> They both without exception get weaker or even
> disappear during even slight solar disturbance.
> We recorded Kvitsoy and other LF/MF frequencies for
> decades. SID effects are short lived but eg after
> the middle of this July Kvitsoy was inaudible here
> for several days. According to studies the mode
> on 1314 should be F2 only on short distances, so
> it is sometimes difficult to decide whether the
> F2 or E or both were affected by D-region block.
> 50 MHz people like to talk about transatlantic Es
> between say UK and NE America but it appears
> that F2 most certainly must play some part in it.
> There appears to be some kind of rather regular
> 'ionospheric ducting' on transatlantic paths.
> Most talk about 'ground bounces' is misleading.
>
> Regards, Vaino, OH2LX
> IARU Region 1 Auroral studies coordinator
>
> At 18:38 16.8.2000 -0000, you wrote:
> >have been watching the postings on CFH and DCF...
> >
> >just what is it you guys are monitoring for, and how are you doing it?
> >
> >what programs do I need etc.? or how may I participate?
> >
> >david
> >
> >QSL VIA E-QSL OR DIRECT....NO BURO
> >
> >http://www.qslcard.com/qslcard/
> >
> >ALL THINGS DIGITAL
>
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