PSN-L Email List Message
Subject: Re: weather
From: Richard Webb dwebb002@.............
Date: Wed, 25 Oct 2006 16:20:38 -0400
Could be something as simple as wind in the trees disturbing the
ground. I see the same problem because my vault, although 6 feet below
ground level is in a wooded area and roots go quite deep.
> Hi All, I was so happy with my sensor, over the last few day. I had
> a major problem with thermos, which disappeared with my insulated
> box. This question has to do with weather changes, and why that
> effects noise.
> A day ago the tract was quiet at night and a little bit of noise
> during the day time and city activities.
> Many hours ago a cold front came thru, arriving at 8:00 pm with
> winds. The trace went from quite to noisy several hour ahead of the
> front. You could look at the trace and see the change as the front
> got closer. This weather should move out in the next 24 hours. So I
> expect things will go back to normal.
> I don't understand, what is stimulating the sensor.
> 1. Does it respond to barometric pressure changes?
> 2. When wind is part of the storm, and the wind moves the trees, is
> this transferred thru the ground to the sensors as earth movements?
> 3. Would a bolt of lightening be displayed on the trace?
> As a front approaches it is like the atmosphere starts to fill with
> electromagnet noise. I'm just trying to understand what creates it.
> Inside the garage and inside the box it seem so isolated, no wind, no
> air current, no vibrations or physical movements. Yet the sensor can
> see a front hours before it arrives.
> Thanks, Ted
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