Hi all I have been slipping.....I forgot to collect last weeks file from the
local cluster so here it is.
Propagation conditions continue to be very disturbed, as the geomagnetic
events run into one another. The plots from SXV (Marathon) show a lot of
absorption in the night-time and also a lot of deep fading. As a result of
these plots and some help from Vaino, and Laurie, I have come to the
conclusion that the 'quiet period' before dawn is only quiet because the
propagation has collapsed. I have a number of plots now that show that the
signals start to decline about an hour before dawn at ground level. They go
down to a level below the normal daytime strengths. This effect is most
noticable on the north-south paths as the sun's UV reaches the D-layer along
the whole path at almost the same time. On east<> west paths like that to
CFH in Canada the curtain 'creeps up' from the east and the path only starts
to fade as a substantial part of it is subjected to solar UV. I am afraid
this is a sad conclusion as we all believed that the noise decreased for
other reasons and it would enable us to hear the weaker stations. The plots
suggest that the best time for this is about an hour before ground sunrise
for paths with a predominantly N<>S track. For E<>W paths the best time is
up to about an hour after ground sunrise at the most easterly station. The
longer the path, the later it is open.
CFH (Halifax N S) is not full back in service so is still only appearing
sporadically and SXV (Marathon) is very difficult to interpret. I am not
sticking my neck out about conditions except to say that there may be
exceptional peaks in signals over the next week but for short periods. It
will all depends on what yesterdays CME arrival did in the way of injecting
particles to the ionosphere, and how much absorbtion they cause.
Cluster spots follow:-
136.6 DJ2LF 29-Apr-2001 0819Z cq
<DL6SN>
136.8 DL3FDO 29-Apr-2001 0750Z cq
<DL6SN>
136.5 DJ7RD 29-Apr-2001 0750Z in qso with dj2ey
<DL6SN>
136.5 DJ2EY 29-Apr-2001 0749Z
<DL6SN>
136.6 DK6NI 28-Apr-2001 1407Z cq
<DL6SN>
136.6 DJ7RD 28-Apr-2001 0727Z cq
<DL6SN>
137.7 OM2TW 22-Apr-2001 1315Z qrss
<DL6SN>
137.7 OM2TW 22-Apr-2001 1250Z cq qrss
<DL6SN>
136.6 DF0WD 22-Apr-2001 1244Z qrz
<DL6SN>
136.6 F6BWO 22-Apr-2001 1241Z in qso with df0wd
<DL6SN>
137.7 OM2YL 22-Apr-2001 1043Z cq qrss
<DL6SN>
136.5 DK6NI 22-Apr-2001 0854Z cq
<DL6SN>
136.8 DL3FDO 22-Apr-2001 0818Z cq
<DL6SN>
137.7 DF6NM 22-Apr-2001 0811Z clg om2yl
<DL6SN>
137.7 OM2YL 22-Apr-2001 0805Z qrss
<DL6SN>
137.5 DF0WD 16-Apr-2001 1740Z psk31
<DL6SN>
137.5 DF6NM 16-Apr-2001 1736Z psk31
<DL6SN>
136.6 OK1DTN 16-Apr-2001 1549Z cq
<OM1BM>
136.5 OK1DTN 16-Apr-2001 1541Z
<DL3FDO>
136.5 SM6CRE 16-Apr-2001 1021Z QRV again with new
<SM6PXJ>
137.7 DK8KW 16-Apr-2001 0855Z clg F5MAF
<DL6SN>
136.8 DJ7RD 16-Apr-2001 0758Z
<DL6SN>
136.8 GW4ALG 16-Apr-2001 0745Z
<DL3FDO>
136.5 M0BMU 15-Apr-2001 1100Z in qso with df0wd
<DL6SN>
136.5 OM2TW 15-Apr-2001 1046Z cq
<OM5CW>
136.5 HA6PC 15-Apr-2001 1030Z just working OM5CW
<OM2TW>
137.0 OK1DTN 15-Apr-2001 1003Z
<DL6SN>
136.3 OK1DTN 15-Apr-2001 1003Z now again CQ...& up OM2TW cq
<HA6PC>
136.7 DF0WD 15-Apr-2001 0957Z in qso with dj6fu
<DL6SN>
136.7 DJ6FU 15-Apr-2001 0957Z
<DL6SN>
G3NYK de GB7MRS 29-Apr-2001 2045Z >
Cheers de Alan G3NYK JO02PB
[email protected]
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