From jweygand@igpp.ucla.edu Thu Jan  2 03:59:52 2025
Date: Wed, 1 Jan 2025 18:59:47 -0800 (PST)
From: James Weygand <jweygand@igpp.ucla.edu>
To: Maria Hamrin <Maria.Hamrin@space.umu.se>
Subject: Re: THEMIS SECS quicklook not working for April 2017?


Hej Maria,

The station is Prince George, BC (PGEO). PG0 is in Antarctica.

FYI, I do not use SuperMAG data. I use the THEMIS FTP site and these have
different station codes and are frequently 4 letters.

Ok, so you are going to use Liisa SECS code applied to North America.
Just be aware that SuperMAG doesn't have all the  stations that I have.
Also, I'm using high temporal resolution data when I can.

thanks,
j

________________________________________________________________________________
From: "Maria Hamrin" <Maria.Hamrin@space.umu.se>
To: "jweygand" <jweygand@igpp.ucla.edu>
Sent: Wednesday, January 1, 2025 3:08:39 AM
Subject: Re: THEMIS SECS quicklook not working for April 2017?

Hi James,

Yes, I know Stephan. In fact, he worked in Umeå a couple months a few years ago
as a guest scientist in my department.

Thanks for the plot with the example of a bad current. A bit scary though,
because this looks just like plots I've seen people showing of events  saying
that there was a big space weather disturbance... Which station did you mean has
the offset? I'd like to look at it in the SuperMAG data base. You wrote PGEO. Is
it PG0 (as far as I know, the IAGA ideintifier is alwarus 3 letters long)?

The master student will start in a few weeks (around Jan 20) so there is no
problem with the server. Moreover, I think he will start by computing the
currents himself first by using the IMAGE code, available in the supplementary
materia of https://link.springer.com/chapter/10.1007/978-3-030-26732-2_2. In
that way he will become familiar with how everything works and also look into
details of the magnetometers and compare with already available currents, e.g.,
on your web. I've had discussions with Liisa Juusola, and the code should be
possible to use both for magnetometers in Scandinavia and in North America.

Happy New Year!

/Maria

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Maria Hamrin                     Email: maria.hamrin@space.umu.se
Associate Professor              Phone: +46 (0)70 325 80 38
Docent in space physics
Department of Physics
Umeå University
Linnaeus väg 24, 901 87 Umeå, Sweden
https://www.umu.se/personal/maria-hamrin/
https://www.umu.se/en/research/groups/space-plasma-physics-group/
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On 1/1/25 00:26, James Weygand wrote:

Hej Maria,

Sorry, Sadly I know no Swedish. I've worked with Stefan Eriksson (Swede)
at LASP  and he has taught me this much.

So thee is good news and bad news. I've finished remaking the plots for
April 2017, but the server is down again
and the IT guy won't be back until next week.

Other news. Attached is an example of a station with a bad offset. There
is a large splotch of current on the west coast.
This is due to a large offset at station PGEO.

Happy new year,
j

________________________________________________________________________________
From: "Maria Hamrin" <Maria.Hamrin@space.umu.se>
To: "jweygand" <jweygand@igpp.ucla.edu>
Sent: Wednesday, December 18, 2024 4:38:41 AM
Subject: Re: THEMIS SECS quicklook not working for April 2017?

Hej (you know a bit Swedish?) James,

Yes please, if you have some samples of weird data, send them to me.

As for April 2017, I don't think it has do be a problem right now. I'll
say to the student to avoid this month, at least in the beginning. So no
hurry with that.

/Maria

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Maria Hamrin                     Email: maria.hamrin@space.umu.se
Associate Professor              Phone: +46 (0)70 325 80 38
Docent in space physics
Department of Physics
Umeå University
Linnaeus väg 24, 901 87 Umeå, Sweden
https://www.umu.se/personal/maria-hamrin/
https://www.umu.se/en/research/groups/space-plasma-physics-group/
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On 12/18/24 02:12, James Weygand wrote:


Hej Maria,

Thanks for considering to include me as a coauthor.

Yes, feel free to include me in a zoom meeting. I hope I'll be able
to contribute.

If I find something weird in the near future I'll send you the
example.
Otherwise just look out for large spikes in the currents or
repeating current patterns over several hours.

FYI, I am slowly making new plots, but I have run into a little
problem.
I can't log into our server and will have to wait until our IT
person fixes the issue.
Also, are there any specific days of primary interest in April 2017
I should complete first.

thanks,
j

________________________________________________________________________________
From: "Maria Hamrin" <Maria.Hamrin@space.umu.se>
To: "jweygand" <jweygand@igpp.ucla.edu>
Sent: Tuesday, December 17, 2024 1:56:45 AM
Subject: Re: THEMIS SECS quicklook not working for April 2017?

Thanks James for your quick answer.

Of course you will be co-author when/if it becomes a paper (it
depends a lot on the student's success). If you want, and if the
student have good success during the spring, I could invite you to a
brainstorm science discussion over zoom. And we will look out for
weird signatures in the data such as current spikes.

Merry Christmas!

/Maria

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Maria Hamrin                     Email: maria.hamrin@space.umu.se
Associate Professor              Phone: +46 (0)70 325 80 38
Docent in space physics
Department of Physics
Umeå University
Linnaeus väg 24, 901 87 Umeå, Sweden
https://www.umu.se/personal/maria-hamrin/
https://www.umu.se/en/research/groups/space-plasma-physics-group/
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On 12/17/24 04:43, James Weygand wrote:


________________________________________________________________________________
From: "Maria Hamrin" <Maria.Hamrin@space.umu.se>
To: "jweygand" <jweygand@igpp.ucla.edu>
Sent: Monday, December 16, 2024 2:20:30 AM
Subject: Re: THEMIS SECS quicklook not working for April 2017?

Dear Maria,

I was in contact with you some weeks ago about your THEMIS
SECS quicklook plots (see below). I'm glad to see that your
server seems to be up and running (but the 2017/4 directory
seems still to be corrupted but that is not why I email you
today).

JMW: Unfortunately the server was down due to hardware
failure. It only just came up last week while I was at AGU. I
will start fixing the quicklook plots as quickly as I can.


Why I'm contacting now is that I'll have a student working for
me the next semester looking into dB/dt spikes and ionospheric
(equivalent) current system. It will be a study inspired by
Schillings et al, [2023] which I co-authored:
https://doi.org/10.1051/swsc/2023018

In specific, I'm planning that the student should compute the
"differential equivalent currents" for some selected events
(similar to what Schillings did using the IMAGE network). To
increases our potential data base for interesting events, we
would however like to use not only IMAGE data but also THEMIS
GBO from North America.

It looks like you have data files of equivalent ionospheric
currents (EICs) on https://vmo.igpp.ucla.edu/data1/SECS/EICS/
together with a README file of the format. That's good. 

My only question to you is if you have any good and/or bad
experiences from computing the differential EICs from your
data sets? Are there any caveats that we should be aware
about? Or anything else we should know before we get started
digging into the data?

JMW: There are a significant number of challenges to computing
the EICs from the magnetometer arrays in North America and
Greenland. Many of the magnetometer datasets have not been
cleaned up. There are a number of data gap problems,
magnetometer offset problems, data errors, and data spikes. I
do what I can to eliminate these problems, but I cannot look
at every bit of data. If you find strange spikes in the
currents let me know the date and time and I'll do what I can
to fix the problem. There is a directory called
https://vmo.igpp.ucla.edu/data1/SECS/Stations/  . This
directory tell you which stations were available for that day
and looking at these files indicates which region had good
data coverage. Obviously avoid data near the edges of the
grid. the SECS can produce strange results there.


Finally, I get little funding to upkeep and add to this
dataset. Please consider including me in your publications. 
Publications help me obtain grants.

thank you for your time,

james


Best,

/Maria

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Maria Hamrin                     Email: maria.hamrin@space.umu.se
Associate Professor              Phone: +46 (0)70 325 80 38
Docent in space physics
Department of Physics
Umeå University
Linnaeus väg 24, 901 87 Umeå, Sweden
https://www.umu.se/personal/maria-hamrin/
https://www.umu.se/en/research/groups/space-plasma-physics-group/
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On 11/23/24 23:48, James Weygand wrote:

Hi Maria,

Yes, I see. Unfortunately our server is being rebuilt.
If you have specific dates and times in mind let me know
and I'll make the plots for you and send them.

thanks,
j

----- Original Message -----
From: "Maria Hamrin" <Maria.Hamrin@space.umu.se>
To: "jweygand" <jweygand@igpp.ucla.edu>
Sent: Saturday, November 23, 2024 6:13:32 AM
Subject: THEMIS SECS quicklook not working for April 2017?

Dear James,

I am looking for THEMIS SECS quicklook plots for a couple of days in 
April 2017 for a potential space weather investigation.

I have checked in https://vmo.igpp.ucla.edu/data1/SECS/Quicklook/2017/04 
but it seems that all days I've looked at contains plots from April 2018 
instead.

I hope that this problem can be fixed.

Many thanks!

Best,
Maria Hamrin

-----------------------------------------------------------------
Maria Hamrin                     Email: maria.hamrin@space.umu.se
Associate Professor              Phone: +46 (0)70 325 80 38
Docent in space physics
Department of Physics
Umeå University
Linnaeus väg 24, 901 87 Umeå, Sweden
https://www.umu.se/personal/maria-hamrin/
https://www.umu.se/en/research/groups/space-plasma-physics-group/
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