From jweygand@igpp.ucla.edu Wed Jan  1 00:27:03 2025
Date: Tue, 31 Dec 2024 15:26:57 -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,

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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