<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 14 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=EN-AU link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>So to summarise?<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><a href="http://www.youtube.com/watch?v=YTfWOhDGifY">http://www.youtube.com/watch?v=YTfWOhDGifY</a><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'> ausnog-bounces@lists.ausnog.net [mailto:ausnog-bounces@lists.ausnog.net] <b>On Behalf Of </b>Paul Brooks<br><b>Sent:</b> Thursday, 8 March 2012 5:54 PM<br><b>To:</b> ausnog@lists.ausnog.net<br><b>Subject:</b> Re: [AusNOG] Solar flare<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>On 8/03/2012 5:03 PM, Scott Howard wrote: <o:p></o:p></p><p class=MsoNormal>On Wed, Mar 7, 2012 at 9:47 PM, Peter Childs <<a href="mailto:PChilds@internode.com.au">PChilds@internode.com.au</a>> wrote:<o:p></o:p></p><div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm'><p class=MsoNormal><quote><br>> As with all computer and networking devices, the AS5400 is susceptible to<br>> the rare occurrence of parity errors in processor memory. Parity errors may<o:p></o:p></p></blockquote><div><p class=MsoNormal><br>These excuses may seem far-fetched, and I used to get a lot of unbelieving looks when I gave this excuse when I was an engineer at Sun - but the simple fact is that it IS true.<br><br>And by true, what I mean is that cosmic rays can and do cause bits to flip, especially in the type of memory used in CPU caches. What may or may not be true is if any specific occurrence was due to cosmic rays - because obviously there's no way to prove that one way or another!<o:p></o:p></p></div></div><p class=MsoNormal style='margin-bottom:12.0pt'><br>As someone who has used and built cosmic-ray and gamma-ray telescopes in the past, I can vouch for this. <br> <br>Cosmic-ray hits show up well in <a href="http://www.astronomy.com/sitefiles/utilities/image.aspx?item=%7B2771D938-60A1-4CD7-BA69-A90A23D62884%7D&mw=900&mh=650">long time exposures of CCD chips</a> - which is just an array of silicon memory gates at the end of the day.<br><br>And if your router is in the cone of a cosmic ray air-shower cascade of subatomic particles.....http://th.physik.uni-frankfurt.de/~drescher/CASSIM/mFe2.mpg<br>:-)<br><br>P.<o:p></o:p></p></div></body></html>