Return-Path: Received: from mtain-mp05.r1000.mx.aol.com (mtain-mp05.r1000.mx.aol.com [172.29.193.73]) by air-db03.mail.aol.com (v129.10) with ESMTP id MAILINDB031-85ef4dd89faa230; Sun, 22 May 2011 01:31:22 -0400 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mp05.r1000.mx.aol.com (Internet Inbound) with ESMTP id 867AC38000095; Sun, 22 May 2011 01:31:20 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1QO1EZ-0006WC-Ov for rs_out_1@blacksheep.org; Sun, 22 May 2011 06:29:47 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1QO1EY-0006W3-U8 for rsgb_lf_group@blacksheep.org; Sun, 22 May 2011 06:29:46 +0100 Received: from imr-da06.mx.aol.com ([205.188.169.203]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1QO1EV-0005e3-T7 for rsgb_lf_group@blacksheep.org; Sun, 22 May 2011 06:29:46 +0100 Received: from mtaout-da03.r1000.mx.aol.com (mtaout-da03.r1000.mx.aol.com [172.29.51.131]) by imr-da06.mx.aol.com (8.14.1/8.14.1) with ESMTP id p4M5TY1O028493 for ; Sun, 22 May 2011 01:29:34 -0400 Received: from White (nrbg-4d074dec.pool.mediaWays.net [77.7.77.236]) by mtaout-da03.r1000.mx.aol.com (MUA/Third Party Client Interface) with ESMTPA id 548A2E0000A2 for ; Sun, 22 May 2011 01:29:31 -0400 (EDT) Message-ID: <1C4214919FE743B3A437CE2A5050A9F6@White> From: "Markus Vester" To: References: <1306007695.17795.25.camel@tomasarhagi> <4DD833C6.1010201@telus.net> Date: Sun, 22 May 2011 07:29:29 +0200 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 12.0.1606 X-MimeOLE: Produced By Microsoft MimeOLE V12.0.1606 X-Spam-Score: 0.3 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,MAILTO_TO_SPAM_ADDR=0.276 Subject: Re: LF: Volcano eruption on my VLF-grabber Content-Type: multipart/alternative; boundary="----=_NextPart_000_0009_01CC1851.FC609F30" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=2.0 required=5.0 tests=HTML_30_40,HTML_MESSAGE, MAILTO_TO_SPAM_ADDR,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: 3039ac1dc1494dd89fa738e6 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none ------=_NextPart_000_0009_01CC1851.FC609F30 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Halld=C3=B3r, for some reason, the Icelandic activity seems to have much more "bass= response" below 4 kHz on your receiver. I have read that for fairly= close lightning events, an enhanced ELF E-field component can be obse= rved, resulting from the quasistatic field term. But with the source= at about 200 km from you, this effect should appear only beneath abou= t 240 Hz. Yes WWLLN is clearly seeing the volcano, so there must be a significan= d fraction of cloud-to-ground lightning. However Blitzortung.org does= not seem to pick it up, which is probably because due to their geogra= phic distribution of detectors, and perhaps also to higher trigger thr= esholds. Best 73, Markus (DF6NM) From: Scott Tilley=20 Sent: Saturday, May 21, 2011 11:51 PM To: rsgb_lf_group@blacksheep.org=20 Subject: Re: LF: Volcano eruption on my VLF-grabber Hi Halldor & group Interesting! I can see the stationary blip on the WWLLN plot over Ice= land, I guess that's your volcano. =20 ... 73 Scott VE7TIL On 5/21/2011 12:54 PM, Halld=C3=B3r wrote: Hi all, Looks like that the new eruption in Iceland is showing up on my VLF-gr= abber. Static activity started as soon as the eruption got through th= e ice around 19:15 and ash began to fall. Lightnings are always in the= ash cloud. Activity is building up. More ash means more lightnings.= It will be interesting to follow this activity next days. 73 Halldor ------=_NextPart_000_0009_01CC1851.FC609F30 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
H= alld=C3=B3r,
 
for some reason, the=20 Icelandic activity seems to have much more "bass= response"=20 below 4 kHz on your receiver. I have read that for fairly close lightn= ing=20 events, an enhanced ELF E-field component can be observed,= resulting=20 from the quasistatic field term. But with the source at abou= t 200 km=20 from you, this effect should appear only beneath about 240= =20 Hz.
 
Yes WWLLN is clearly seeing the volca= no, so there=20 must be a significand fraction of cloud-to-ground lightning. However= =20 Blitzortung.org does not seem to pick it up, which is probably be= cause due=20 to their geographic distribution of detectors, and perhaps= also to=20 higher trigger thresholds.
 
Best 73,
Markus (DF6NM)
From:=20 Scott Tilley
Sent: Saturday, May 21,= 2011 11:51=20 PM
Subject: Re: LF: Volcano= eruption on=20 my VLF-grabber

Hi Halldor & group

Interes= ting!  I=20 can see the stationary blip on the WWLLN plot over Iceland, I guess th= at's your=20 volcano.   
...
73 Scott
VE7TIL


On 5/21= /2011 12:54=20 PM, Halld=C3=B3r wrote:
Hi all,
Looks like that the new eruption in= Iceland is=20 showing up on my VLF-grabber.  Static activity started as soon as= the=20 eruption got through the ice around 19:15 and ash began to fall.= Lightnings=20 are always in the ash cloud. Activity is building up. More ash me= ans more=20 lightnings. It will be interesting to follow this activity next=20 days.

73
Halldor
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