Schumann Resonances

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Connected a 12" dia coil of about 100 turns of #12 copper wire to a 5000/4 Ohm output transformer backwards into an Analog Discovery USB device. Got a spectrum that looks close to the Schumann resonances (contaminated with some mains noise).
 

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Not a bad ADC on that Discovery!

And how much does that contraption weigh? 6-7 lbs before the transformer, roughly? Also, how quiet is your environment?

(This is all very, *very* cool. Might need to replicate with my niece and/or HS demos at some point)
 
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Not a bad ADC on that Discovery!

And how much does that contraption weigh? 6-7 lbs before the transformer, roughly? Also, how quiet is your environment?

(This is all very, *very* cool. Might need to replicate with my niece and/or HS demos at some point)

I just came home tonight inspired by the LIGO success and cobbled this together with no expectations. Just fun no more no less.
 
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Thanks for that Scott. I was looking for something similar when I probed the ground in my yard with an ADC. What I found was mains AC noise, 60Hz and scads of harmonics.

FWIW, I used to sell very good power supplies for Schumann resonators. Yeah, I know, I know. But they sold like hotcakes. We tried the resonators in the office listening room. No one could tell any difference. But we were far out in the country, a long way from mains transmission lines and other EM pollution. All the resonator power supplies went to very urban environments. Never figured out if that was significant or not.
 
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Chakras related or not, they are real and we can measure them.
They are been monitored as a reliable globe-wide lightning activity indicator.
Measured peaks vary a bit in frequency and Q and a lot in amplitude. Statistically they peak during local late afternoon.
A good read about underpinning atmospheric electric phenomena is this book
Atmospheric Electrodynamics | H. Volland | Springer

George
 
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Update,

Tried again this morning slightly different and made sure shorting my coil made them go away :). I'm slightly bothered that the lowest peak is lower in frequency than usually cited so I still need to verify that this is not a false alarm. But a set of noisy low Q peaks like this are easily observable in simple DIY experiments. Maybe George found the site, it's in Italy found under a search for ULF radio. They have several PC based options. The power output transformer backwards was my idea for a signal boost. The signal is in pico-Tesla range.

EDIT just noticed the peak at ~7Hz is moving slowly higher in freq (a good sign?).
 
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Dumb question, but is the drift in the signal, or something 'settling' in your measurement rig?

An actual frequency shift would be hard to account for since the clock is crystal derived and percents of frequency shift are unlikely.

Here's the DIY site in Italy, lots of science fair material here. http://www.vlf.it/
 
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That's what I thought, but was confused based on your earlier note that 7Hz is too low for the normal 7.8Hz reported. Of course I haven't yet managed to read the links Prof. George Google has found :) so being unsure if the drift is normal was scratching my head as to cause.
 
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Update,
Tried again this morning slightly different and made sure shorting my coil made them go away :). I'm slightly bothered that the lowest peak is lower in frequency than usually cited so I still need to verify that this is not a false alarm
EDIT just noticed the peak at ~7Hz is moving slowly higher in freq (a good sign?).

There is not an exact frequency for the first S.W. mode.
2nd & 3rd mode also drift in frequency.

Here's the DIY site in Italy, lots of science fair material here. RADIO WAVES below 22 kHz

Just on time! I was reading this
ICS101 - Induction Coil
There are a couple of long investigations I have left unfinished due to my postponing building decent front ends for electric and magnetic sensors that pick up ELF to VLF signals from the air and route them through an acquisition module to a pc for recording and analysis.
This Italian site is the garden of Eden.

Of course I haven't yet managed to read the links Prof. George Google has found :) so being unsure if the drift is normal was scratching my head as to cause.

It’s in the links. Read them or you’ll lose this Semester :D



SY, don’t tell me I haven’t tried.
http://www.salzburg.gv.at/cherry_schumann_resonances.pdf

George
 
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