I'm not sure about literature as I havn't looked but there have been some
large CME (coronial mass ejection) events from the sun that have hit earth
in the last couple of months.
These will move a compass (slightly) and since seismometers are very
sensitive to changes in magnetic fields, it is quite likely that you could
see these events with a long period seismometer.

Our radio Astronomy group in South Australia runs a magnetometer which I
have built http://www.radio-assa.org.au/magnetometer , sees these events,
typical changes are +-100nT , sometimes up to +-500nT which would cause much
trouble, the diurnal variation each day is usually much lower around +-20nT.
Earth's magnetic field is typ 50,000nT.

Our Australian Space Weather Agency see
http://www.ips.gov.au/Geophysical/1/1 has magnetograms, I'm sure you will be
able to find nearer stations to you.
Try googling space weather or magnetograms..

There are professionals and amateurs that monitor these events and the
addition of a sensitive magnetometer to a seismic station would be quite
worthwhile.

There is enough energy in these events to cause fluctuations in pipe lines,
bring power grids and communication networks down worldwide, damage
satellites and are responsible for Auroral displays..

Several years ago I believe this was responsible for the wide power outages
experienced in America.

Blair Lade

-----Original Message-----
From: psnlist-request@.............. [mailto:psnlist-request@...............
On Behalf Of Thomas Dick
Sent: Wednesday, 13 July 2011 3:34 AM
To: psnlist@..............
Subject: Ambient ground noise and solar flares?

I have not been satisfied with my seismic units; an AS-1 and two 
homemade Laymans,  running Larry's software and electronics. The last 
two months the FFT shows strong peaks at ~.2 hz and .04hz. These peaks 
are unusually strong this year ...vertical scale log over 50 and 
reaching 120. This is based on taking FFT's at about 3 AM local time 
provided there is no regional or teleseimic earthquake data coming in. 
Is there any literature on this ambient noise being associated with 
sunspot activity? I noticed a flare was recorded yesterday and about the 
same time last month. It even affected my cell phone range. The oceans 
and surface storms that I normally attribute to these peaks have been 
relatively mild the last week here in middle U.S. Any comments?
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