Hi Alan/all - I can confirm (very) poor Northern Auroral crossing paths at HF to LF as seen from here in Alaska at the moment - pesky Protons really wreck havoc at this geo mag latitude. Im not seeing any of my normal Eu stations at all on any MF/HF freqs (up to 14Mhz).
Our Antipodean friends on the South North Path are reasonable that dont cross the Auroral oval (which they do virtually twice to Eu on some paths). Of course the Northern Polar path being mostly in daylight doesnt help much either :-) - hoping things "cool" down sooner rather than later.
At VLF DHO38 is some 20/30dBs or more weaker in the Alaskan summer than Winter, and the signal is very flat during the +24 hr period with little predawn tilt and increase in signal.
Just going South a few degrees geomag wise makes a huge difference.
Laurence KL7UK, gardening in Wasilla Alaska.
> From: [email protected]
> To: [email protected]
> Date: Fri, 10 Jun 2011 10:23:40 +0100
> Subject: LF: Re: LF propagation
>
> Hi Stefan, there has been some geomagnetic activity that might account for
> the poor conditions you saw. Yes poor propagation also affects the noise
> level at this time of year because a lot of the noise is lighning induced
> and may travel a long distance. Even noise from distances beyond 1000km
> could be affected. As Markus suggested there has been a fairly long lastig
> proton event which began on the 7th. There are known to cause Polar Cap
> Absorption and the hot electrons may well have diffused to lower latitudes
> before decaying. There was also some further minor storm level geomagnetic
> activity on the 8th though the Dst index which I use as a guide to
> night-time absorption did not drop substantially.
>
> Thanks for the comments I would not have spotted the "quieter" conditions.
>
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