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<font face="Arial">I think that would work. Have to finish some
assembly here and then come up with a schedule.<br>
Jules<br>
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<div class="moz-cite-prefix">On 10/13/2020 5:13 PM, Dr. Nathaniel A.
Frissell Ph.D. wrote:<br>
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<p class="MsoNormal">Hi Hyomin and Jules,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">If I’m available, I’d like to join you as
well. I’d really enjoy getting to meet Jules in person.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">73 de Nathaniel<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b>From:</b> Kim, Hyomin
<a class="moz-txt-link-rfc2396E" href="mailto:hmkim@njit.edu"><hmkim@njit.edu></a> <br>
<b>Sent:</b> Tuesday, October 13, 2020 5:02 PM<br>
<b>To:</b> Julius Madey <a class="moz-txt-link-rfc2396E" href="mailto:hillfox@fairpoint.net"><hillfox@fairpoint.net></a><br>
<b>Cc:</b> TAPR TangerineSDR Modular Software Defined Radio
<a class="moz-txt-link-rfc2396E" href="mailto:tangerinesdr@lists.tapr.org"><tangerinesdr@lists.tapr.org></a>; John Gibbons
<a class="moz-txt-link-rfc2396E" href="mailto:jcg66@case.edu"><jcg66@case.edu></a>; David Witten
<a class="moz-txt-link-rfc2396E" href="mailto:wittend@wwrinc.com"><wittend@wwrinc.com></a>; Dr. Nathaniel A. Frissell Ph.D.
<a class="moz-txt-link-rfc2396E" href="mailto:nathaniel.frissell@scranton.edu"><nathaniel.frissell@scranton.edu></a><br>
<b>Subject:</b> Re: [TangerineSDR] Fwd: another 24hour
RM3100 run and comparison with Fredericksburg<o:p></o:p></p>
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<p class="MsoNormal">Hi Jules - Thanks for your tip. Would you
be willing to come down here to install it together? It
would be fun!<o:p></o:p></p>
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<p class="MsoNormal">All - It appears that the magnetometer
I have is behaving well. However, it would be better if I
have about >2 sets so I can check whether all the
sensors are consistently behaving (which is extremely
important for such a largely spaced network
configuration). Do we have a timeline for more testing
sets? If not, I will visit Jenny Jump to install the
sensor again with a better temperature management scheme
as Jules suggested. <o:p></o:p></p>
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<p class="MsoNormal">Sorry for my slow response. I am quite
swamped by my teaching workload this semester (somewhat
unexpected...). <o:p></o:p></p>
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<p class="MsoNormal">Cheers,<o:p></o:p></p>
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<p class="MsoNormal">Hyomin<o:p></o:p></p>
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<p class="MsoNormal"
style="line-height:12.0pt"><strong><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#6F6F6F">Hyomin
Kim</span></strong><span
style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#232636"><br>
</span><span
style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#6F6F6F">Assistant
Professor</span><span
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</span><span
style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#6F6F6F">Physics<br>
</span><span
style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#666666">Center
for Solar-Terrestrial Research<br>
Institute for Space Weather
Sciences</span><span
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</span><span
style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#666666"><a
href="mailto:hmkim@njit.edu"
target="_blank"
moz-do-not-send="true">hmkim@njit.edu</a> • (973) 596-5704<br>
<a
href="https://web.njit.edu/~hmkim/"
target="_blank"
moz-do-not-send="true">https://web.njit.edu/~hmkim/</a><br>
104 Tiernan Hall, 161 Warren
Street, Newark, NJ 07102</span><span
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<p class="MsoNormal">On Mon, Oct 5, 2020 at 6:07 PM Julius
Madey <<a href="mailto:hillfox@fairpoint.net"
moz-do-not-send="true">hillfox@fairpoint.net</a>>
wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span
style="font-family:"Arial",sans-serif">Hyomin,<br>
During your run, the temperature of the 3100 was
probably reasonably constant so your result is
consistent with basic 3100 specs. Keeping the
temperature constant over 24 hours should give you a
close alignment with future JJ station measurements.
Good news.
<br>
I can house your rm3100 in the same way I did mine or,
I think I have enough extra parts now from Dave to
make one up and send it down .... possibly drive it
down since you're about 150 road miles from here,
which I can do in three hours.<br>
Jules<br>
<br>
</span><o:p></o:p></p>
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<p class="MsoNormal">On 10/5/2020 5:31 PM, Kim, Hyomin
wrote:<o:p></o:p></p>
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<p class="MsoNormal">Hi Dave, Jules and Nathaniel,<o:p></o:p></p>
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<div>
<p class="MsoNormal">Sorry that it took me so long
to work on the data that was retrieved from Jenny
Jump. The two sensors (Bartington and our mag)
were placed inside a solenoid which was then
placed inside a mu-metal case. Long story short,
there is NO reason to believe that our
magnetometer behaves in a different way compared
to the other. They trace the artificially
generated fields well. The only thing that needs
to be addressed later is that the given field was
so big that the output signals were saturated -
the fields inside the solenoids should have been
decreased to avoid saturation. My oversight that I
had to leave the site in a rush. However, both
sensors traced the fields in the same way. I hope
I will have more time to stay at Jenny Jump next
time to monitor the signals more carefully as the
NJIT system has now been fixed. <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Please share this during the
Tangerine meeting tonight as I will not be able to
attend it this time due to the conflict with my
lecture which is expected to be longer than last
week...<o:p></o:p></p>
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<p class="MsoNormal">Hyomin<o:p></o:p></p>
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<p class="MsoNormal"
style="line-height:12.0pt"><strong><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#6F6F6F">Hyomin
Kim</span></strong><span
style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#232636"><br>
</span><span
style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#6F6F6F">Assistant
Professor</span><span
style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#232636"><br>
</span><span
style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#6F6F6F">Physics<br>
</span><span
style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#666666">Center
for Solar-Terrestrial
Research<br>
Institute for Space
Weather Sciences</span><span
style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#232636"><br>
</span><span
style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#666666"><a
href="mailto:hmkim@njit.edu" target="_blank" moz-do-not-send="true">hmkim@njit.edu</a> • (973) 596-5704<br>
<a
href="https://web.njit.edu/~hmkim/"
target="_blank"
moz-do-not-send="true">https://web.njit.edu/~hmkim/</a><br>
104 Tiernan Hall, 161
Warren Street, Newark,
NJ 07102</span><span
style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#232636"><o:p></o:p></span></p>
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<p class="MsoNormal">On Tue, Sep 22, 2020 at 9:45 PM
Julius Madey via TangerineSDR <<a
href="mailto:tangerinesdr@lists.tapr.org"
target="_blank" moz-do-not-send="true">tangerinesdr@lists.tapr.org</a>>
wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span
style="font-family:"Arial",sans-serif">Dear John,<br>
Yes, temperature information was posted a
while back. PNI initially claimed that there
was no temperature effect due to the
essentially self compensating scheme used for
field measurement. After I measured as much as
a 7-10nT per degree C tempco in some
controlled oven experiments and sharing that
data with PNI, PNI eventually replied that
engineering had measured a maximum of +/- 2nT
per degree C for the inductors alone but had
not characterized the complete sensor.<br>
<br>
The data I have taken so far is not complete
but indicates that the tempco (1) may not be
equal on all axes, including differences in
sign and (2) may not be assumed to be equal
for any two units and (3) may not be linear
with temperature, making algorithmic
correction of the recorded data difficult.<br>
<br>
Hence, my attempts to achieve temperature
stabilization to better than 1 degree C over
24 hours for the recordings I've been doing
(sensor in a housing that can be easily buried
sub surface).<br>
<br>
Have also done some experiments with an
insulated chamber containing a thermal mass,
equivalent to a low pass filter, to achieve
stabilization.
<br>
<br>
Another approach is a temperature controlled
oven set to a few degrees above expected
maximum local ambient temp but that requires
power, which complicates long cable runs.<br>
<br>
At just 19-20 inches below grade in my shaded
woodlot, 24 hour temperature stability has
been within 0.7C. Another 12-16 inches for
the next install should bring that to a
diurnal variation of perhaps 0.1C in this
location.<br>
<br>
Jules K2KGJ<br>
<br>
<br>
</span><o:p></o:p></p>
<div>
<p class="MsoNormal">On 9/22/2020 7:52 PM, John
Gibbons wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">All,<o:p></o:p></span></p>
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style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">I
have not kept up on this thread due to
other commitments, but I don't see any
mention of the temperature data and
plotting correlated to the data
acquisition of the 3 axis magnetometer
(or more likely I missed it).<o:p></o:p></span></p>
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<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">I
believe that the RM3100 uses ferrite
core inductors for the 3 axis magnetic
pickups and ferrites definitely have a
tempco (voice of experience...). Even a
1 Deg C may have an impact on the mu of
the ferrite at the 1nT measurement
levels.<o:p></o:p></span></p>
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<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">You've
probably already done this (if so please
point me to it) but has this been looked
at / tested for / quantified?<o:p></o:p></span></p>
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style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">John
N8OBJ<o:p></o:p></span></p>
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<p
class="MsoNormal">John
C. Gibbons<o:p></o:p></p>
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<p
class="MsoNormal">Director
- Sears
Undergraduate
Design
Laboratory<o:p></o:p></p>
</div>
<p
class="MsoNormal">Dept.
of Electrical
Engineering
and Computer
Science<o:p></o:p></p>
</div>
</div>
<p
class="MsoNormal">Case
Western
Reserve
University <o:p></o:p></p>
</div>
<div>
<p
class="MsoNormal">10900
Euclid Ave, <span
style="font-size:9.5pt">Glennan 314</span><o:p></o:p></p>
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<div>
<p
class="MsoNormal"
style="margin-bottom:12.0pt"><span
style="font-size:9.5pt;font-family:"Helvetica",sans-serif;color:black">Cleveland,
Ohio
44106-7071<br>
Phone </span><a
href="tel:216-368-2816" target="_blank" moz-do-not-send="true"><span
style="font-size:9.5pt;font-family:"Helvetica",sans-serif;color:#1155CC">(216)
368-2816</span></a><span
style="font-size:9.5pt;font-family:"Helvetica",sans-serif;color:black"> FAX </span><a
href="tel:216-368-6888" target="_blank" moz-do-not-send="true"><span
style="font-size:9.5pt;font-family:"Helvetica",sans-serif;color:#1155CC">(216)
368-6888</span></a><span
style="font-size:9.5pt;font-family:"Helvetica",sans-serif;color:black"><br>
E-mail: </span><a
href="mailto:jcg66@case.edu" target="_blank" moz-do-not-send="true"><span
style="font-size:9.5pt;font-family:"Helvetica",sans-serif;color:#1155CC">jcg66@case.edu</span></a><o:p></o:p></p>
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<p class="MsoNormal">On Mon, Sep 21, 2020 at
4:18 PM Julius Madey via TangerineSDR <<a
href="mailto:tangerinesdr@lists.tapr.org" target="_blank"
moz-do-not-send="true">tangerinesdr@lists.tapr.org</a>>
wrote:<o:p></o:p></p>
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<p class="MsoNormal"
style="margin-bottom:12.0pt"><span
style="font-family:"Arial",sans-serif">Forgot
to mention that one thing to keep in
mind is the difference in raw data
processing between the absolute value
sliding 1minute average plots I do
with a spreadsheet with the more
complex algorithm delta B plots from
Intermagnet. I'm not sure how the
10nT anomaly would appear if the same
Intermagnet processing algorithm was
used.<br>
Hyomin ?????</span><o:p></o:p></p>
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<p class="MsoNormal">On 9/15/2020 10:38
AM, Phil Erickson wrote:<o:p></o:p></p>
</div>
<blockquote
style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class="MsoNormal">Hi Dave, <o:p></o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"> The X and Y
traces return after 24 hours to
nearly the same relative value in
both the reference and RM3100
traces. The Z trace does not.
Ionospheric currents flowing in
the E region should not affect Z
exclusive of X and Y under most
any geometry I can think of, so I
wondered whether the uncalibrated
RM3100 was likely causing this.
(I have never professionally
calibrated a magnetometer, so
Hyomin might need to comment
here.). In other words, I always
assume there is some measurement
systematic until it has been
completely ruled out before
assigning it to geophysical
variation.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">73<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">Phil W1PJE<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<div>
<p class="MsoNormal">On Tue, Sep 15,
2020 at 10:34 AM David Witten <<a
href="mailto:wittend@wwrinc.com"
target="_blank"
moz-do-not-send="true">wittend@wwrinc.com</a>>
wrote:<o:p></o:p></p>
</div>
<blockquote
style="border:none;border-left:solid
#CCCCCC 1.0pt;padding:0in 0in 0in
6.0pt;margin-left:4.8pt;margin-right:0in">
<div>
<p class="MsoNormal">@Phil, <o:p></o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Correlation
is great, and surely some
further calibration issues may
remain. But these sensors are
NOT colocated - (200-300+ mi
apart?) . Wouldn't it be
suspicious if they did
correlate perfectly? If they
did, shouldn't we ask if we
do really need an extensive
array of these sensors?
Presumably there will always
be some local variation at
this scale? (don't know, just
asking)<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Dave
Witten, KD0EAG<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<div>
<p class="MsoNormal">On Tue, Sep
15, 2020 at 7:21 AM Phil
Erickson <<a
href="mailto:phil.erickson@gmail.com"
target="_blank"
moz-do-not-send="true">phil.erickson@gmail.com</a>>
wrote:<o:p></o:p></p>
</div>
<blockquote
style="border:none;border-left:solid
#CCCCCC 1.0pt;padding:0in 0in
0in
6.0pt;margin-left:4.8pt;margin-right:0in">
<div>
<p class="MsoNormal">Hi all,<o:p></o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"> There
appears to be a 10 nT
drift in the Z component
for the RM3100 that is not
in the Fredericksburg
traces. Is that slow
systematic bias expected?
Maybe things are not
calbrated over that time
frame quite yet?<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">73<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">Phil
W1PJE<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<div>
<p class="MsoNormal">On Mon,
Sep 14, 2020 at 10:49 PM
David Witten via
TangerineSDR <<a
href="mailto:tangerinesdr@lists.tapr.org"
target="_blank"
moz-do-not-send="true">tangerinesdr@lists.tapr.org</a>>
wrote:<o:p></o:p></p>
</div>
<blockquote
style="border:none;border-left:solid
#CCCCCC 1.0pt;padding:0in
0in 0in
6.0pt;margin-left:4.8pt;margin-right:0in">
<div>
<p class="MsoNormal"
style="margin-bottom:12.0pt">I
don't believe that my
previous post carried
the file K2KGJ provided.<o:p></o:p></p>
<div>
<div>
<p class="MsoNormal">----------
Forwarded message
---------<br>
From: <strong><span
style="font-family:"Calibri",sans-serif">Julius Madey</span></strong>
<<a
href="mailto:hillfox@fairpoint.net"
target="_blank"
moz-do-not-send="true">hillfox@fairpoint.net</a>><br>
Date: Mon, Sep 14,
2020 at 4:26 PM<br>
Subject: another
24hour RM3100 run
and comparison with
Fredericksburg<br>
To: Kim, Hyomin <<a
href="mailto:hmkim@njit.edu" target="_blank" moz-do-not-send="true">hmkim@njit.edu</a>>,
David Witten <<a
href="mailto:wittend@wwrinc.com" target="_blank" moz-do-not-send="true">wittend@wwrinc.com</a>>,
Dr. Nathaniel A.
Frissell Ph.D. <<a
href="mailto:nathaniel.frissell@scranton.edu" target="_blank"
moz-do-not-send="true">nathaniel.frissell@scranton.edu</a>>,
Dave Larsen <<a
href="mailto:kv0s.dave@gmail.com"
target="_blank"
moz-do-not-send="true">kv0s.dave@gmail.com</a>><o:p></o:p></p>
</div>
<p class="MsoNormal"
style="margin-bottom:12.0pt"><o:p> </o:p></p>
<div>
<p class="MsoNormal"><span
style="font-family:"Arial",sans-serif">All, <br>
I was hoping to
record a
relatively short
term event but
missed one about
10 days ago.
However, there was
a good run on the
12th with an ~30nT
excursion on the Y
axis lasting about
an hour. In the
attached pdf, the
three axes of the
RM3100 again track
the Fredericksburg
magnetometer
station data quite
closely. The
RM3100 plotted
data points are
simple running
60second averages
and not the more
complex filtering
algorithm used by
Intermagnet
stations for their
1 minute data
points.
<br>
<br>
The vertical axes
scales on all
plots are as close
as I could match
them by eye in
cutting and
pasting.<br>
<br>
I believe the
value to the right
on the Intermagnet
plot is the mean
for the 24 hour
period. I did not
try to compute a
24 hour mean.<br>
<br>
One of the
products for the
future for general
interest would be
a running plot
like those
available on
Intermagnet.org.
I guess we can
dream a bit.
<br>
<br>
Jules - K2KGJ</span><o:p></o:p></p>
</div>
</div>
</div>
<p class="MsoNormal">-- <br>
TangerineSDR mailing list<br>
<a
href="mailto:TangerineSDR@lists.tapr.org"
target="_blank"
moz-do-not-send="true">TangerineSDR@lists.tapr.org</a><br>
<a
href="http://lists.tapr.org/mailman/listinfo/tangerinesdr_lists.tapr.org"
target="_blank"
moz-do-not-send="true">http://lists.tapr.org/mailman/listinfo/tangerinesdr_lists.tapr.org</a><o:p></o:p></p>
</blockquote>
</div>
<p class="MsoNormal"><br
clear="all">
<o:p></o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<p class="MsoNormal">-- <o:p></o:p></p>
<div>
<p class="MsoNormal">----<br>
Phil Erickson<br>
<a
href="mailto:phil.erickson@gmail.com"
target="_blank"
moz-do-not-send="true">phil.erickson@gmail.com</a><o:p></o:p></p>
</div>
</blockquote>
</div>
</blockquote>
</div>
<p class="MsoNormal"><br clear="all">
<o:p></o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<p class="MsoNormal">-- <o:p></o:p></p>
<div>
<p class="MsoNormal">----<br>
Phil Erickson<br>
<a
href="mailto:phil.erickson@gmail.com"
target="_blank"
moz-do-not-send="true">phil.erickson@gmail.com</a><o:p></o:p></p>
</div>
</blockquote>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<p class="MsoNormal">-- <br>
TangerineSDR mailing list<br>
<a
href="mailto:TangerineSDR@lists.tapr.org"
target="_blank" moz-do-not-send="true">TangerineSDR@lists.tapr.org</a><br>
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href="http://lists.tapr.org/mailman/listinfo/tangerinesdr_lists.tapr.org"
target="_blank" moz-do-not-send="true">http://lists.tapr.org/mailman/listinfo/tangerinesdr_lists.tapr.org</a><o:p></o:p></p>
</blockquote>
</div>
</blockquote>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<p class="MsoNormal">-- <br>
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<a href="mailto:TangerineSDR@lists.tapr.org"
target="_blank" moz-do-not-send="true">TangerineSDR@lists.tapr.org</a><br>
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</blockquote>
</div>
</blockquote>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
</blockquote>
</div>
</div>
</blockquote>
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