On Thu, 14 Dec 2006 23:52:22 -0500, "C. J. Clegg"
wrote:

On Fri, 15 Dec 2006 02:25:42 +0000, Owen Duffy wrote:

Do you know what f0F2 was at the path midpoint, or are you depending
on interpolation?


You missed my point, it isn't so much as the exact location of the
virtual midpoint, but is there an ionosound measureing that point, or
is the map constructed by interpolating measurements from just a small
number of ionsondes, and is the interpolation sound?

Well, the path midpoint was pretty much straight up, or maybe up to 20
degrees off of vertical. foF2 all along the path was just a bit under 3
MHz. Frequency of operation was well above 4 MHz.

In this neck of the woods, there is abundant sporadic E,

I should have added "at this time". But sporadic E is most likely
around the solstices, so you should be seeing a bit in the northern
hemisphere.


I don't really know much about sporadic E, have a vague idea what it is
and that's about all, but doesn't it assume that there is an E layer to
begin with? This was about 7:30 PM, sunset was around 4:45 PM, and the E
layer would have been pretty much gone along with the sun, wouldn't it?

Sporadic E does not depend on sunlight, it is one of the mysteries of
Es.

Owen
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