David,
There are many forms of sporadic E (Es). Looking at global ionograms I see Es
every day of the week, even though it's allegedly most prevalent in summer. Es
propagation can be very stable too.
The F layer critical frequency can vary with solar flaring and changes in the
background flux.
73,
Thomas F. Giella, KN4LF
Retired Space & Atmospheric Weather Forecaster
Plant City, FL, USA
Grid Square EL87WX
Lat & Long 27 58 33.6397 N 82 09 52.4052 W
kn4lf@arrl.net
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----- Original Message -----
From: David Ackrill
To: 'a Propagation Reflector'
Sent: Wednesday, December 08, 2004 11:09 AM
Subject: RE: [Propagation] 5MHz Night time propagation question
-----Original Message-----
From: propagation-bounces@contesting.com
>David et all,
> The HF critical frequency could have stayed higher than 5 mhz and/or you
>may have been experiencing some sporadic E (Es) propagation.
Thanks for the suggestions Thomas,
Es seems a bit of a long shot, the signals were fairly consistent, and the
only reason I didn't log them past 23:00 was that I went to bed. HI!
What would cause the critical frequency to stay over 5MHz well past the
normal closing of NVIS propagation, I wonder? I don't remember anything
unusual in the reports which are sent out (thanks for them, by the way, very
interesting) that might have suggested that something unusual was going on.
Dave (G0DJA)
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