[HCDX] Re: [SWL] Bands back
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[HCDX] Re: [SWL] Bands back
11/2/03 10:09:48 AM, "Levine, Joan" <jlevine@xxxxxxxxxxxxxxxxxxxxxx> wrote:
> Strange...after 45 minutes of dead quiet...10,15,17 meters back at
> 1810 UTC. No explanation.
The higher frequencies always "bounce back" after a solar flare. As the X-ray
radiation subsides from a flare, the D-layer's ionization subsides. This allows
the higher frequencies to start punching through the D-layer, again, making it
up to the E and F layers. If the MUF is high enough in the F layer, those
higher frequency signals will then be refracted and propagated.
A good place to view the "effected" area of a flare and the estimated
frequencies affected is at
http://www.sec.noaa.gov/rt_plots/dregion.html
A full list of links, like this, are on my propagation page (
http://prop.hfradio.org ).
73 de Tomas, NW7US (AAR0JA/AAM0EWA)
--
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