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Date: Sat, 28 Jan 2017 17:26:18 -0500
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Subject: RE: ULF: EbNaut over 3 wavelengths on ULF
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Paul,

Excellent diagnostic method and implementation. 

Thanks also for applying the method to the ULF experiments, and to 3kHz propagation in general. I don’t remember seeing a measurement of the type that you have made, near the rather unique region of ~ 2.5 kHz to 4 kHz and at these distances in which modal and polarization effects can be substantial. Very informative.

Even the fact that the method is apparently robust at 3kHz to the path disturbance caused by the aggregate lightning; and to the anisotropy of the lightning is interesting and valuable. The accuracy of commercial lightning geolocation for example couldn’t be extrapolated directly to a prediction of robustness of your method to the path disturbance caused by aggregate lightning; and to anisotropy of the lightning even with 172 sferics. Thank you for a collection of valuable observations and findings

73,

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, January 28, 2017 9:21 AM
To: rsgb_lf_group@blacksheep.org
Subject: Re: ULF: EbNaut over 3 wavelengths on ULF


On the 26th there was stormy weather all day near Marseille, not exactly Heidelberg but it's a start.  It's in the right quadrant but longer distance.

(It made me think of Garlaban and I ended up reading La lettre de Lili des Bellons à Marcel Pagnol - moving and beautiful.)

I used vttoga to collect timings of all the sferics received at Todmorden, Bielefeld and Cumiana during 10:00 to 14:00.  Then I used vtspot to determine which sferics originated in the region
of Marseille.   This produced a list of 172 sferics to analyse.

I inspected each one using vtplot and discarded the scruffy ones, keeping the best 54.

vtcmp -m pd360 then compared the phase angles from the three rx channels during each sferic.

I concluded that the relative phase of the channels was just as expected for this quadrant at 3kHz.  That means the propagation cannot be doing anything too surprising with the polarisation at this frequency.

--
Paul Nicholson
--