PSN-L Email List Message

Subject: Low period noise
From: jonfr500@.........
Date: Sun, 10 Dec 2006 22:31:39 +0000

Hi all

I am suffering from a hard disk failure at my main computer, so I am using =
my secondary computer to send this email. I won't be able to fix it until T=
uesday at the first. The hard disk is giving up, being 3 years old and all =

But that is not what I did want to speak about. On my sensor I see a low pe=
riod noise. This is not the weather, the weather is fine so far. This low p=
eriod noise is so low that it registers from 0.1Hz and to 1Hz, but the main=
 peak is around 0.2Hz. This would not have been interesting except for the =
fact that this low period noise also appears on the sensors that IMO is run=
ning. This has also mean that there is a increase in noise on frequency's a=
round 4Hz. This might be a storm related noise, but if someone has a differ=
ent idea what this might be. Please let me know.

My first idea on this that this might be related to change in volcano press=
ure somewhere. I am not sure however on that, yet. I saw something like thi=
s happen before Grimsvotn eruption in 2004, but on a lot smaller scale. The=
n there was a increase in background noises few hours before the eruption, =
I saw it back then on IMO sensor. I didn't have a sensor at that time.

J=F3n Fr=EDmann.  =20

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