Re: [HCDX]: Re: A Index & MW DXing

[Hermod Pedersen <hermod.pedersen@xxxxxxxxxxxxxx>]

>> I don't think the A index alone is a good indicator of reception as one
of the
>> best ever W Coast NA openings I've heard was when the A index was nigh
on 100!
>Yes, but you are looking the situation from NZ.  Here in Scandinavia
>signals from NA traveölto us over the North Pole. If A is high there
>is aurora & absorption on polar routes -> signals from NA disappear.

This also affects signals coming from Latin America. When NA signals are
depressed by aurora, life becomes more easy for signals coming in a more
southernly path.
This is even more enhanced in the tropical bands. When a storm hits the
atmosphere, lots of signals on the Northern hemisphere is blocked out,
leaving a more clean path to signals from regions around the Equator. Thus
signals from central Africa and Peru/Bolivia get an extra boost during
stormy conditions - that is, if it is not too stormy, when all signals are
affected unfavourable.

/Hermod Pedersen
Nordic Shortwave Center <http://swl.shortwave.se/>