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Date: Sat, 11 Feb 2017 12:58:42 -0500
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Subject: RE: ULF: 5 wavelengths on the 101 km band? Valid or not?
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Congratulations and compliments Stefan, Paul and Renato, Markus and Wolf for enabling and providing what so far seems to be the only published experimental data for this poorly-understood part of the spectrum and path space. This 5-wavelength result seems like a lone empirical narrowband reference in a 2kHz - 4kHz, 500km - 1000km wilderness.  

- Jim AA5BW


-----Original Message-----
From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Paul Nicholson
Sent: Saturday, February 11, 2017 10:56 AM
To: rsgb_lf_group@blacksheep.org
Subject: Re: ULF: 5 wavelengths on the 101 km band? Valid or not?


I scraped the pixels off the Cumiana spectrogram, (summing each row) and did my best guess of reversing the mapping of power to pixel brightness.

  http://abelian.org/vlf/tmp/170211a.png

2970 is the strongest line.  At least 3 sigma, maybe 4, depending on how you treat the lumpy floor.  A physicist would insist on 5 sigma but the fact that the peak is at exactly the right frequency is significant in itself.

Markus just wrote:

 > In my humble opinion, this is clearly a successful  > detection.

I was doubtful looking at the spectrogram but having plotted the pixels I am convinced.

Spectrograms aren't good for this sort of thing.  Oh
for a spectrum plot!   I couldn't get anything from
the stream recording, too many timing breaks on the uplink.

Best I can get in Todmorden is 2 and a bit sigma using just the daytime signal in 3.9 uHz.  Not significant at all.  Would need at least another 7 days of transmission.

--
Paul Nicholson
--