From jweygand@igpp.ucla.edu Tue Dec 17 04:43:07 2024
Date: Mon, 16 Dec 2024 19:43:02 -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?



________________________________________________________________________________
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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