[time-nuts] WWVB & Eclipse

Bob kb8tq kb8tq at n1k.org
Thu Jul 13 19:17:59 EDT 2017


Hi

I think we are both taking it as a given that the eclipse’s impact on the ionosphere will
be “visible” even with a fairly simple setup. I guess that might qualify for a very loose 
definition of the term “hypothesis” in my case. I can’t speak for Tom. 

Bob

> On Jul 13, 2017, at 6:24 PM, William H. Fite <omniryx at gmail.com> wrote:
> 
> Tom, are some specific hypotheses being tested or is this purely
> exploratory?
> 
> Bill
> 
> 
> On Thursday, July 13, 2017, Tom Van Baak <tvb at leapsecond.com> wrote:
> 
>> The trick is to just run the timing receiver in all-in-view mode
>> collecting 1PPS data against your house standard as usual, but also capture
>> all the binary message(s) where the per-SV Az/El/SNR and phase residuals
>> are reported. This allows you to re-create the individual "1PPS" from each
>> SV used in the timing solution. Or maybe just use the RINEX data. This is
>> what I was referring to in the CORS reference to Brooke.
>> 
>> It would be "cheating" to know the eclipse path ahead of time and mine the
>> data for confirmation. Instead I dare you to blindly mine the GPS data for
>> all of August and then make a bold claim when and where the eclipse was,
>> like capturing a trace through a cloud chamber. Having done all that you
>> can "look in the back of the book" for the actual eclipse path to see how
>> right you were.
>> 
>> /tvb
>> 
>> ----- Original Message -----
>> From: "Bob kb8tq" <kb8tq at n1k.org <javascript:;>>
>> To: "Tom Van Baak" <tvb at leapsecond.com <javascript:;>>; "Discussion of
>> precise time and frequency measurement" <time-nuts at febo.com <javascript:;>
>>> 
>> Sent: Thursday, July 13, 2017 3:01 PM
>> Subject: Re: [time-nuts] WWVB & Eclipse
>> 
>> 
>> Hi
>> 
>> If one perhaps knew the path of the eclipse in advance *and* had a GPS
>> timing receiver that
>> could be set somehow to look at a single satellite….. all one would need
>> is a means of comparing
>> the output to a stable reference to *possibly* observe something
>> interesting.
>> 
>> More or less: You know the path of eclipse roaring along bashing the
>> ionosphere. You can (maybe)
>> pick a sat who’s signal traverses that region while getting to your
>> location during the eclipse. Yes, it’s
>> not original science. It might still be fun.
>> 
>> Bob
>> 
>> 
>> 
>>> On Jul 13, 2017, at 5:55 PM, Tom Van Baak <tvb at LeapSecond.com> wrote:
>>> 
>>> Brooke,
>>> 
>>> Nice set of links. Thanks. There's a poster here with an overview:
>>> 
>>> https://cedarweb.vsp.ucar.edu/wiki/images/6/60/Magdalina_
>> Moses-Eclipse_Research_CEDAR_Poster.pdf
>>> 
>>>> Is there a study based on GPS observations?
>>> 
>>> It will all be there for free in CORS. It's just a matter of mining the
>> data.
>>> Apparently this is done a lot. Here are some random examples of what can
>> be done. Pretty amazing.
>>> 
>>> https://www.ngs.noaa.gov/PUBS_LIB/2005_01_ION_NTM_Ionosphere.pdf
>>> http://www.gps.gov/cgsic/smg/2004/smith.pdf
>>> https://arxiv.org/pdf/1006.3565.pdf
>>> 
>>> Google for a subset of words like: CORS Ionosphere Monitoring Analysis
>> Modeling TEC
>>> 
>>> /tvb
>>> 
>>> ----- Original Message -----
>>> From: "Brooke Clarke" <brooke at pacific.net <javascript:;>>
>>> To: "Discussion of precise time and frequency measurement" <
>> time-nuts at febo.com <javascript:;>>
>>> Sent: Thursday, July 13, 2017 1:35 PM
>>> Subject: [time-nuts] WWVB & Eclipse
>>> 
>>> 
>>>> Hi:
>>>> 
>>>> There's a massive experiment relating to the strength of WWVB and a
>> transmitter in Dixon California.
>>>> 
>>>> https://www.washingtonpost.com/news/speaking-of-science/
>> wp/2017/07/12/a-massive-atmospheric-experiment-is-
>> planned-for-august-solar-eclipse/?utm_term=.4d7101b869f6
>>>> 
>>>> http://eng.umb.edu/~eclipsemob/index.php <http://eng.umb.edu/%
>> 7Eeclipsemob/index.php>
>>>> 
>>>> http://www.hamsci.org/sites/default/files/publications/
>> 2017_IES_Liles.pdf
>>>> This article says Dixon may transmit at 55.1 and 135.95 kHz.
>>>> 
>>>> The EclipseMob receiver works with a smart phone acting as an SDR. as
>> well as the source of it's position and the
>>>> date-time of observation.
>>>> 
>>>> There is a parallel study based on ham radio WSPRNet and Reverse Beacon
>> Network.
>>>> http://hamsci.org/
>>>> 
>>>> Is there a study based on GPS observations?
>>>> 
>>>> --
>>>> Have Fun,
>>>> 
>>>> Brooke Clarke, N6GCE
>>>> http://www.PRC68.com
>>>> http://www.end2partygovernment.com/2012Issues.html
>>>> 
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> 
> 
> -- 
> William H Fite, PhD
> Independent Consultant
> Statistical Analysis & Research Methods
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