Return-Path: Received: from mtain-dh06.r1000.mx.aol.com (mtain-dh06.r1000.mx.aol.com [172.29.65.26]) by air-dc03.mail.aol.com (v129.10) with ESMTP id MAILINDC031-85ff4df24d933b1; Fri, 10 Jun 2011 13:00:03 -0400 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dh06.r1000.mx.aol.com (Internet Inbound) with ESMTP id D524838000183; Fri, 10 Jun 2011 13:00:00 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1QV530-0007RB-4u for rs_out_1@blacksheep.org; Fri, 10 Jun 2011 17:59:02 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1QV52z-0007R2-J8 for rsgb_lf_group@blacksheep.org; Fri, 10 Jun 2011 17:59:01 +0100 Received: from blu0-omc1-s16.blu0.hotmail.com ([65.55.116.27]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1QV52x-00077r-Oc for rsgb_lf_group@blacksheep.org; Fri, 10 Jun 2011 17:59:01 +0100 Received: from BLU153-W19 ([65.55.116.9]) by blu0-omc1-s16.blu0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4675); Fri, 10 Jun 2011 09:58:53 -0700 Message-ID: X-Originating-IP: [216.137.237.71] From: Laurence KL7UK To: Date: Fri, 10 Jun 2011 08:58:52 -0800 Importance: Normal In-Reply-To: <001601cc2750$60f0c300$4001a8c0@lark> References: <4DF11A74.9080609@iup.uni-heidelberg.de>,<001601cc2750$60f0c300$4001a8c0@lark> MIME-Version: 1.0 X-OriginalArrivalTime: 10 Jun 2011 16:58:53.0014 (UTC) FILETIME=[AD6A6760:01CC278F] X-Spam-Score: 0.9 (/) X-Spam-Report: autolearn=disabled,HTML_10_20=0.945,HTML_MESSAGE=0.001 Content-Type: multipart/alternative; boundary="_1c48eb9d-7225-4882-a47a-bc94649967a7_" Subject: RE: LF: Re: LF propagation X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=FORGED_HOTMAIL_RCVD, HTML_MESSAGE autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false x-aol-global-disposition: G x-aol-sid: 3039ac1d411a4df24d9013c8 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) --_1c48eb9d-7225-4882-a47a-bc94649967a7_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Alan/all - I can confirm (very) poor Northern Auroral crossing paths = at HF to LF as seen from here in Alaska at the moment - pesky Protons reall= y wreck havoc at this geo mag latitude. Im not seeing any of my normal Eu = stations at all on any MF/HF freqs (up to 14Mhz). Our Antipodean friends on the South North Path are reasonable that dont cro= ss the Auroral oval (which they do virtually twice to Eu on some paths). Of= course the Northern Polar path being mostly in daylight doesnt help much e= ither :-) - hoping things "cool" down sooner rather than later.=20 At VLF DHO38 is some 20/30dBs or more weaker in the Alaskan summer than Win= ter, and the signal is very flat during the +24 hr period with little preda= wn tilt and increase in signal. Just going South a few degrees geomag wise makes a huge difference. Laurence KL7UK, gardening in Wasilla Alaska. > From: alan.melia@btinternet.com > To: rsgb_lf_group@blacksheep.org > Date: Fri, 10 Jun 2011 10:23:40 +0100 > Subject: LF: Re: LF propagation >=20 > Hi Stefan, there has been some geomagnetic activity that might account fo= r > the poor conditions you saw. Yes poor propagation also affects the noise > level at this time of year because a lot of the noise is lighning induced > and may travel a long distance. Even noise from distances beyond 1000km > could be affected. As Markus suggested there has been a fairly long lasti= g > proton event which began on the 7th. There are known to cause Polar Cap > Absorption and the hot electrons may well have diffused to lower latitude= s > before decaying. There was also some further minor storm level geomagneti= c > activity on the 8th though the Dst index which I use as a guide to > night-time absorption did not drop substantially. >=20 > Thanks for the comments I would not have spotted the "quieter" conditions= . >=20 =3D --_1c48eb9d-7225-4882-a47a-bc94649967a7_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Alan/all  - I can confirm (very)  poor Northern Auroral crossi= ng  paths at HF to LF as seen from here in Alaska at the moment - pesk= y Protons really wreck havoc at this geo mag latitude.  Im not seeing = any of my normal Eu stations at all on any MF/HF freqs (up to 14Mhz).
Our Antipodean friends on the South North Path are reasonable that dont c= ross the Auroral oval (which they do virtually twice to Eu on some paths). = Of course the Northern Polar path being mostly in daylight doesnt help much= either :-)   - hoping things "cool" down sooner rather than late= r.

At VLF DHO38 is some 20/30dBs or more weaker in the Alaskan summ= er than Winter, and the signal is very flat during the +24 hr period with l= ittle predawn tilt and increase in signal.

Just going South a few de= grees geomag wise makes a huge difference.

Laurence KL7UK, gardening= in Wasilla Alaska.






> From: alan.melia@btinte= rnet.com
> To: rsgb_lf_group@blacksheep.org
> Date: Fri, 10 Jun= 2011 10:23:40 +0100
> Subject: LF: Re: LF propagation
>
&g= t; Hi Stefan, there has been some geomagnetic activity that might account f= or
> the poor conditions you saw. Yes poor propagation also affects t= he noise
> level at this time of year because a lot of the noise is l= ighning induced
> and may travel a long distance. Even noise from dis= tances beyond 1000km
> could be affected. As Markus suggested there h= as been a fairly long lastig
> proton event which began on the 7th. T= here are known to cause Polar Cap
> Absorption and the hot electrons = may well have diffused to lower latitudes
> before decaying. There wa= s also some further minor storm level geomagnetic
> activity on the 8= th though the Dst index which I use as a guide to
> night-time absorp= tion did not drop substantially.
>
> Thanks for the comments I= would not have spotted the "quieter" conditions.
>
= =3D --_1c48eb9d-7225-4882-a47a-bc94649967a7_--