Return-Path: Received: from mtain-dg01.r1000.mx.aol.com (mtain-dg01.r1000.mx.aol.com [172.29.65.9]) by air-dd02.mail.aol.com (v128.1) with ESMTP id MAILINDD023-86584bc6d82e111; Thu, 15 Apr 2010 05:11:10 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-dg01.r1000.mx.aol.com (Internet Inbound) with ESMTP id BF092380000AE; Thu, 15 Apr 2010 05:11:08 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1O2L5D-0005JQ-HV for rs_out_1@blacksheep.org; Thu, 15 Apr 2010 10:09:59 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1O2L5D-0005JH-53 for rsgb_lf_group@blacksheep.org; Thu, 15 Apr 2010 10:09:59 +0100 Received: from imr-da06.mx.aol.com ([205.188.169.203]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1O2L5A-0000IV-Rh for rsgb_lf_group@blacksheep.org; Thu, 15 Apr 2010 10:09:59 +0100 Received: from mtaout-da06.r1000.mx.aol.com (mtaout-da06.r1000.mx.aol.com [172.29.51.134]) by imr-da06.mx.aol.com (8.14.1/8.14.1) with ESMTP id o3F99h7x009873 for ; Thu, 15 Apr 2010 05:09:44 -0400 Received: from Black (g229148092.adsl.alicedsl.de [92.229.148.92]) by mtaout-da06.r1000.mx.aol.com (MUA/Third Party Client Interface) with ESMTPA id 80FB4E0000B0 for ; Thu, 15 Apr 2010 05:09:43 -0400 (EDT) Message-ID: From: "Markus Vester" To: References: <000c01cadbca$b43bdfe0$6d01a8c0@DELL4> In-Reply-To: Date: Thu, 15 Apr 2010 11:08:50 +0200 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Windows Mail 6.0.6000.16480 X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6000.16669 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: LF: Re: Re: VLF...alpha long selective fade? Content-Type: multipart/alternative; boundary="----=_NextPart_000_0055_01CADC8C.07302B90" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.9 required=5.0 tests=HTML_30_40,HTML_MESSAGE, MISSING_OUTLOOK_NAME 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: 3039ac1d41094bc6d82c6d7a X-AOL-IP: 193.82.116.20 ------=_NextPart_000_0055_01CADC8C.07302B90 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Jay, one more remark on the interpretation of your observation: In your ima= ge, there is clearly a 1.66 Hz envelope structure. Given the 11.905 kH= z sequence [ N . K E . . ], this must be a superposition of K (Krasnod= ar, presumably across the Atlantic) and E (Khabarovsk, more likely acr= oss the Pacific). Apparently the Krasnodar signal is experiencing a ph= ase advance during the observation period, caused by sunrise over Euro= pe and the Atlantic lowering the D-layer. 73, Markus The mechanism is similar to selective fading, but the delay involved= is not from propagation but from the (much longer) transmitter delay.= If you were for example getting only N and K, the two dashes 1.2 seco= nds apart would result in a 0.83 Hz periodic ripple in the spectral en= velope. As the transmitters are laid out on a ~ 6000 km baseline, the compon= ents will have different diurnal phase variations, resulting in a slow= movement of the minima in the spectrogram. If the later component is= lagging more, the ripple pattern moves down in frequency (ie. contrac= ts towards zero). ... ------=_NextPart_000_0055_01CADC8C.07302B90 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Jay,
 
one more remark on the interpretation= of your=20 observation: In your image, th= ere is clearly=20 a 1.66 Hz envelope structure. Given the 11.905 kHz sequence [ N . K E . . ], this must be a=20 superposition of K (Krasnodar, presumably across the Atlantic)=20 and E (Khabarovsk, more= likely across=20 the Pacific). Apparently the Krasnodar signal is experiencing a= phase=20 advance during the observation period, caused by sunrise over Eur= ope and=20 the Atlantic lowering the D-layer.
 
73, Markus
The=20 mechanism is similar to selective fading, but the del= ay=20 involved is not from propagation but from the (much longer) tra= nsmitter=20 delay. If you were for example getting only N and K, the two da= shes 1.2=20 seconds apart would result in a 0.83 Hz periodic ripple in the= spectral=20 envelope.
 
As the transmitters are laid out on= a ~ 6000 km=20 baseline, the components will have different diurnal phase variation= s,=20 resulting in a slow movement of the minima in the spectrogram. = If the=20 later component is lagging more, the ripple pattern moves down in fr= equency=20 (ie. contracts towards zero).
...
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