[SEDXC] Solar Storm Web Site

[Ernie Zingleman]

The presentation at the SEDXC club meeting was on propagation.

I thought I'd pass along this link for those of you that were and the SEDXC
club meeting and those of you that couldn't make it.

The below link will show you (during a solar storm or unsettled solar
conditions) which frequencies will be attenuated (and how much attenuation)
by the D layer of the ionosphere.  As the storm worsens, you can see that
the amount of attentuation at a given frequency will increase; additionally
you can see that the attentuation will be worse at lower frequences and less
at higher ones. Even if the F layer is ionized enough to create a path, if
the D layer is highly ionized, the path won't be there or will be severely
weakened.  The D layer response, unlike the F layer, will be like trying to
bounce a rubber ball on deep pile carpet.

http://sec.noaa.gov/rt_plots/dregion.html

http://sec.noaa.gov/rt_plots/dregionEvent/2003_Oct_28_0951JS.html

Check it out and select the "x17 x-ray even on October 28, 2003.  It is a
java script animation of the event.  You can see it reach an initial peak,
weaken then increase again; this as it moves from east to west.   If some of
you recall, this was a big solar storm that occured on a CQ WW SSB weekend.
Solar flux, and the K & A indices all went sky high.  After the storm calmed
down, the higher solar activity did proivde band openings on 15 meters that
were unexpected and were actually very good.

73, Ernie KS4Q