Re: [IRCA] the big black absorptive cloud

[Russ Edmunds <wb2bjh@xxxxxxxxx>]

--- Nick Hall-Patch <nhp@xxxxxxxx> wrote:

> At 17:04 03/11/2007, you wrote:
> 
> 
> >In terms of the MidWinter Anomaly on MW going back to the 1960's,
> it's
> >extremely early for such. Further, "Classic MwA" conditions are not
> >usually - at least on the EC - associated with a lack of signals but
> >rather a lack of anything of any real interest - the regular
> >powerhouses should still be there. I'm not convinced that this isn't
> >something more transitory, such as a localized geomagbnetic
> >disturbance, which of course, we will see.
> 
> 
> Thanks for the correction, Russ.   My own experience of TA's from the
> 
> east coast is very limited, so I was basing that on Gordon Nelson's 
> article (NRC reprint P1??) where he says "TA conditions fall off very
> 
> noticeably in November",  which is certainly the case with TP 
> conditions here, which in some years fall off noticeably even from
> mid October.
> 
> Nothing yet on the geomagnetic side of things as far as this morning 
> goes, apparently.
> 
>

The problem with using that article literally is that the observation
period is very short. Over the years that I DX'ed actively in Northern
NJ, the onset of the MwA was usually late November or early December.
It often lasted into February. One can't say that it couldn't have
started already but that certainly wouldn't be the norm.

Unless that solar flux alert Mauno quoted had something to do with it,
which is certainly possible, there's been nothing else.



Russ Edmunds
Blue Bell, PA ( 360' ASL )
[15 mi NNW of Philadelphia]
40:08:45N; 75:16:04W, Grid FN20id
<wb2bjh@xxxxxxxxx>
FM: Yamaha T-80 & Onkyo T-450RDS w/ APS9B @15'
AM: Hammarlund HQ-150 & 4' FET air core loop

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