Return-Path: Received: (qmail 28807 invoked from network); 29 Apr 2001 21:41:49 -0000 Received: from unknown (HELO murphys-inbound.servers.plus.net) (212.159.14.225) by 10.226.25.101 with SMTP; 29 Apr 2001 21:41:49 -0000 Received: (qmail 1456 invoked from network); 29 Apr 2001 21:41:47 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys with SMTP; 29 Apr 2001 21:41:47 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 14tybg-0006yv-00 for rsgb_lf_group-outgoing@blacksheep.org; Sun, 29 Apr 2001 22:19:52 +0100 Received: from carbon.btinternet.com ([194.73.73.92]) by post.thorcom.com with esmtp (Exim 3.16 #2) id 14tybf-0006yl-00 for rsgb_lf_group@blacksheep.org; Sun, 29 Apr 2001 22:19:51 +0100 Received: from [213.123.15.205] (helo=default) by carbon.btinternet.com with smtp (Exim 3.03 #83) id 14tybB-0003OE-00 for rsgb_lf_group@blacksheep.org; Sun, 29 Apr 2001 22:19:21 +0100 Message-ID: <002001c0d0f1$a530abe0$cd0f7bd5@default> From: "Alan Melia" To: "LF-Group" Subject: LF: DX Cluster spots 21/22 & 28/29 April at GB7DXM Date: Sun, 29 Apr 2001 22:08:53 +0100 MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 4.72.3110.5 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: 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 136.8 DL3FDO 29-Apr-2001 0750Z cq 136.5 DJ7RD 29-Apr-2001 0750Z in qso with dj2ey 136.5 DJ2EY 29-Apr-2001 0749Z 136.6 DK6NI 28-Apr-2001 1407Z cq 136.6 DJ7RD 28-Apr-2001 0727Z cq 137.7 OM2TW 22-Apr-2001 1315Z qrss 137.7 OM2TW 22-Apr-2001 1250Z cq qrss 136.6 DF0WD 22-Apr-2001 1244Z qrz 136.6 F6BWO 22-Apr-2001 1241Z in qso with df0wd 137.7 OM2YL 22-Apr-2001 1043Z cq qrss 136.5 DK6NI 22-Apr-2001 0854Z cq 136.8 DL3FDO 22-Apr-2001 0818Z cq 137.7 DF6NM 22-Apr-2001 0811Z clg om2yl 137.7 OM2YL 22-Apr-2001 0805Z qrss 137.5 DF0WD 16-Apr-2001 1740Z psk31 137.5 DF6NM 16-Apr-2001 1736Z psk31 136.6 OK1DTN 16-Apr-2001 1549Z cq 136.5 OK1DTN 16-Apr-2001 1541Z 136.5 SM6CRE 16-Apr-2001 1021Z QRV again with new 137.7 DK8KW 16-Apr-2001 0855Z clg F5MAF 136.8 DJ7RD 16-Apr-2001 0758Z 136.8 GW4ALG 16-Apr-2001 0745Z 136.5 M0BMU 15-Apr-2001 1100Z in qso with df0wd 136.5 OM2TW 15-Apr-2001 1046Z cq 136.5 HA6PC 15-Apr-2001 1030Z just working OM5CW 137.0 OK1DTN 15-Apr-2001 1003Z 136.3 OK1DTN 15-Apr-2001 1003Z now again CQ...& up OM2TW cq 136.7 DF0WD 15-Apr-2001 0957Z in qso with dj6fu 136.7 DJ6FU 15-Apr-2001 0957Z G3NYK de GB7MRS 29-Apr-2001 2045Z > Cheers de Alan G3NYK JO02PB Alan.Melia@btinternet.com