On Jul 13, 2017, at 5:55 PM, Tom Van Baak tvb@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

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@pacific.net
To: "Discussion of precise time and frequency measurement" time-nuts@febo.com
Sent: Thursday, July 13, 2017 1:35 PM
Subject: [time-nuts] WWVB & Eclipse

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On Jul 13, 2017, at 5:55 PM, Tom Van Baak tvb@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

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@pacific.net
To: "Discussion of precise time and frequency measurement" time-nuts@febo.com
Sent: Thursday, July 13, 2017 1:35 PM
Subject: [time-nuts] WWVB & Eclipse

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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@n1k.org javascript:;>
To: "Tom Van Baak" <tvb@leapsecond.com javascript:;>; "Discussion of
precise time and frequency measurement" <time-nuts@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

Moses-Eclipse_Research_CEDAR_Poster.pdf

data.

be done. Pretty amazing.

Modeling TEC

time-nuts@febo.com javascript:;>

transmitter in Dixon California.

wp/2017/07/12/a-massive-atmospheric-experiment-is-
planned-for-august-solar-eclipse/?utm_term=.4d7101b869f6

7Eeclipsemob/index.php>

2017_IES_Liles.pdf

well as the source of it's position and the

Network.

mailman/listinfo/time-nuts

mailman/listinfo/time-nuts

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On Jul 13, 2017, at 6:24 PM, William H. Fite omniryx@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@leapsecond.com wrote:

--
William H Fite, PhD
Independent Consultant
Statistical Analysis & Research Methods

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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

javascript:;> wrote:

javascript:;> wrote:

capture

each

is

the

for

how

"Discussion of

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can

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Beacon

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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

javascript:;> wrote:

Hi Bill,

No, it's was a good question, don't worry about that. I just don't have a
good answer, or one that stays on-topic for time-nuts.

If you read a bunch of papers about eclipses you'll find that all sorts of
interesting and rare things do or may occur. And especially for this modern
one in 2017, scientists are ready to see what they can see. Presumably over
the next year you'll slowly read reports varying from dark matter or
gravity to ionosphere or animal behavior, to who knows what, etc. Some
positive, some negative; some legit, some bogus.

A total solar eclipse is more than the majestic sight of the sky going
dark for a minute. Consider that solar radiation is something like 1 kW /
sq meter, or 1 GW per sq km. The 2000 mile-an-hour black spot of totality
is about 60 mi across. Call it 100 km square and this means the moon
suddenly interrupts 10,000 GW of power from hitting the atmosphere and
ground. That's kind of a lot. Multiply that by 100 s (roughly how long
totality lasts above your head) and you get 1,000 TJ (Tera-Joules) of
sudden "missing" energy over your head. For perspective, the Hiroshima bomb
was "just" 60 TJ worth of energy [1].

I don't know what this energy on-off-on toggle switch will do. But surely
it will do something subtle and interesting and maybe measurable. So
tracking WWVB or GPS signal strength and latency and stuff like that is a
pretty cheap experiment that may or may not have interesting results. It's
once-in-a-lifetime for most of us.

So that's what Bob & I were referring to. Earlier I sent links showing the
kind of research people can do with raw GPS signal data, well beyond what
we do here with just 1PPS measurements.

/tvb

[1] https://en.wikipedia.org/wiki/TNT_equivalent

----- Original Message -----
From: "William H. Fite" <omniryx@gmail.com javascript:;>
To: "Discussion of precise time and frequency measurement" <
time-nuts@febo.com javascript:;>
Sent: Thursday, July 13, 2017 8:06 PM
Subject: Re: [time-nuts] WWVB & Eclipse

Did I put my foot in it? It was a sincere question.

On Thursday, July 13, 2017, Bob kb8tq <kb8tq@n1k.org javascript:;>
wrote:

javascript:;

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