Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-md04.r1000.mx.aol.com (Internet Inbound) with ESMTP id 6A34C380001AF; Sat, 9 Feb 2013 19:28:16 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1U4KSv-0000d0-KK for rs_out_1@blacksheep.org; Sun, 10 Feb 2013 00:08:17 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1U4KSv-0000cr-44 for rsgb_lf_group@blacksheep.org; Sun, 10 Feb 2013 00:08:17 +0000 Received: from imr-db03.mx.aol.com ([205.188.91.97]) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1U4KSs-0003i4-Mr for rsgb_lf_group@blacksheep.org; Sun, 10 Feb 2013 00:08:16 +0000 Received: from mtaout-mb04.r1000.mx.aol.com (mtaout-mb04.r1000.mx.aol.com [172.29.41.68]) by imr-db03.mx.aol.com (Outbound Mail Relay) with ESMTP id 3679C38000091; Sat, 9 Feb 2013 19:07:57 -0500 (EST) Received: from Black (188-194-147-156-dynip.superkabel.de [188.194.147.156]) by mtaout-mb04.r1000.mx.aol.com (MUA/Third Party Client Interface) with ESMTPA id 6F60CE0000BB; Sat, 9 Feb 2013 19:07:56 -0500 (EST) Message-ID: From: "Markus Vester" To: , Date: Sun, 10 Feb 2013 01:07:53 +0100 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 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20121107; t=1360454877; bh=dleMwLCq40w8bpjxnfOz4J+vOIgrQnm8sIr4T/XLekc=; h=From:To:Subject:Message-ID:Date:MIME-Version:Content-Type; b=K0LtqoQqEzIQpP+bR7wtBA9zrG6ryAjYVe7LWHUeQ94bPutvfa5oOUH7hd0Bff0PC LlKmlmGgiJMTJyBf7aA3rmpcZiZ0wljT8gkXaAgAPuSqLLvxI3UZKyzIRVMLG+3Vnt qQkASwzSuKc8i82OVm15iQ7dfPEX4I3qaTydCiYY= X-AOL-SCOLL-SCORE: 0:2:295832480:93952408 X-AOL-SCOLL-URL_COUNT: 0 X-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: On my LF grabber http://www.df6nm.de/grabber/Grabber.htm there is again a ~ 200 Hz wide red noise band centered on 137.08 kHz. It has been observed several times before but has been absent for a few months. Sometimes it is accompanied by a weaker "brother", centered on 137.18 kHz with purple (ie. northerly) colour. The structure is reminiscent of an MSK signal ("the ghost of CFH"). The bands were seen regularly but are stronger in nights with strong Luxemboug effect. [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [205.188.91.97 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (markusvester[at]aol.com) -0.0 SPF_PASS SPF: sender matches SPF record -0.0 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 WEIRD_PORT URI: Uses non-standard port number for HTTP 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 027eb28428a0ed4e20e06b28d08cfc7b Subject: LF: Ghost bands created by VLF ionospheric heating Content-Type: multipart/alternative; boundary="----=_NextPart_000_0008_01CE072B.0D73BCC0" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: ** X-Spam-Status: No, hits=2.5 required=5.0 tests=HTML_20_30,HTML_MESSAGE, MISSING_OUTLOOK_NAME,WEIRD_PORT 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-SCOLL-AUTHENTICATION: mtain-md04.r1000.mx.aol.com ; domain : mx.aol.com DKIM : fail X-AOL-OVERRIDE-PIK-REASON: Y x-aol-sid: 3039ac1d60585116e99f6cce X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none This is a multi-part message in MIME format. ------=_NextPart_000_0008_01CE072B.0D73BCC0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable On my LF grabber http://www.df6nm.de/grabber/Grabber.htm there is again = a ~ 200 Hz wide red noise band centered on 137.08 kHz. It has been = observed several times before but has been absent for a few months. = Sometimes it is accompanied by a weaker "brother", centered on 137.18 = kHz with purple (ie. northerly) colour. The structure is reminiscent of = an MSK signal ("the ghost of CFH"). The bands were seen regularly but = are stronger in nights with strong Luxemboug effect. =20 After a lot of head scratching, a while ago I have found a really = astonishing explanation for this effect: It is ionospheric cross = modulation, with a pair of strong VLF transmitters acting together as a = modulated heater.=20 DHO38 on 23.4 kHz and HWU (which has recently reappeared on 21.75 kHz) = have a difference frequency of 1.65 kHz, with the sum of the two FSK = shifts. Similar to an AM demodulator, the beat frequency between the two = transmitters modulates the electron temperature in the D-layer, and the = variable absorption creates crossmodulation on the carriers of HGA22 = (135.43 + 1.65 kHz) and DCF39 (138.83 - 1.65 kHz). This constellation is = rather unusual not only in that the heating is done by VLF signals. What = is even more peculiar is that unlike a simple AM transmitter, the two = non-colocated heaters must produce an inhomogeneous and fast moving = heating pattern. If you look at the Twente WebSDR http://websdr.ewi.utwente.nl:8901/ now, = you can currently see and hear prominent 1.65 kHz FSK sidebands around = DCF39 and also DCF49 (128.93 kHz). However HGA seems less affected at = Twente, presumably because the easterly reflection area is not so well = illuminated for that path. Best 73, Markus (DF6NM) ------=_NextPart_000_0008_01CE072B.0D73BCC0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
On my LF grabber http://www.df6nm.de/grab= ber/Grabber.htm there=20 is again a ~ 200 Hz wide red noise band centered on 137.08 = kHz. It has=20 been observed several times before but has been absent for a few months. = Sometimes it is accompanied by a weaker "brother", = centered on=20 137.18 kHz with purple (ie. northerly) colour. The structure = is=20 reminiscent of an MSK signal ("the ghost of CFH"). The bands were seen regularly but are stronger = in nights with=20 strong Luxemboug effect. 
 
After a lot of head scratching, a = while ago I=20 have found a really astonishing explanation for this effect: = It=20 is ionospheric cross modulation, with a pair of strong VLF = transmitters=20 acting together as a modulated heater.
 
DHO38 on 23.4 kHz and HWU (which = has recently=20 reappeared on 21.75 kHz) have a difference frequency of 1.65 = kHz, with=20 the sum of the two FSK shifts. Similar to an AM=20 demodulator, the beat frequency between the two transmitters modulates = the=20 electron temperature in the D-layer, and the variable = absorption=20 creates crossmodulation on the carriers of HGA22 (135.43 + 1.65 kHz) and = DCF39=20 (138.83 - 1.65 kHz). This constellation is rather unusual not only=20 in that the heating is done = by VLF=20 signals. What is even more peculiar is that unlike a = simple AM=20 transmitter, the two non-colocated heaters must produce an=20 inhomogeneous and fast moving heating pattern.
 
If you look at the Twente WebSDR http://websdr.ewi.utwente.nl:= 8901/ now,=20 you can currently see and hear prominent 1.65 kHz FSK = sidebands around=20 DCF39 and also DCF49 (128.93 kHz). However HGA seems less = affected at=20 Twente, presumably because the easterly reflection area is not so well=20 illuminated for that path.
 
Best 73,
Markus (DF6NM)
 
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