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: [email protected]
[mailto:[email protected]] On Behalf Of Paul Nicholson
Sent: Saturday, February 11, 2017 10:56 AM
To: [email protected]
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
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