For the first time ever (May 1996), 48MHz
European video was heard from here via Es during our winter Es
season. Unfortunately no European QSOs resulted. however, the
VO1ZA beacon was heard on 27 Dec. Here are the dates and times:
||48.242 (CT grid
||48.249 (EA grid
||48.251 (EA grid
|11 Jan 96
||48.249 (EA grid
This is extremely rare and I thought the timing
would be of interest to the 6m DX community. while on the subject
of timing, I have plotted the 6m summer diurnal distribution for
East Coast to European Es, and used it to try to predict the
diurnal distribution for winter Es. The results are interesting:
The first plot (Fig 1) shows UTC times versus
QSO rates for each and every transatlantic Es QSO (1502 QSOs)
that I have made over the last 10 years. I believed that this
plot is the most important of all. The plot covers any QSOs made
during the entire summer Es season which runs approx. 1 June
through 31 July. The left scale Y axis shows the distribution of
contacts in percent, and you can see that the maximum probability
is at around 2200z.
average solar elevation for 1 July
This plot (Fig. 2) shows the scaled diurnal
variation against the corrected average solar elevations of the
three equidistant path midpoints between FN43AD and IN80. The
three path midpoints are 105km above grids FN95, HN17, and IN34.
Solar elevations were calculated at the ground
and raised 10.3 degrees to account for the better 'view' at
E-layer height, using a formula that compresses the 'lift' at
higher angles. Note that any average elevations that are less
than zero are forced to a zero value.
Calculated diurnal variation for trans-Atlantic Es on
27 December 1995.
This may be considered a joke, but not really.
The potential solar influence on the summer diurnal for 1 July
was estimated using a complex array of polynomials, a Gaussian
distribution and interpolation to obtain a 'baseline' formula
that fits the summer diurnal nicely. A simple program was written
and the results are plotted for 27 Dec 1995. It shows maximum
probability occurs around 1800z. I would be interested to It
shows how this diurnal compares to the facts. To the best of my
knowledge, no 3+ hop winter Es 50MHz QSOs have ever occurred!
UKSMG Six News issue