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<font face="Arial">Hyomin,<br>
Since our last, I've had to devote time to several other matters
and haven't progressed much toward your unit. However, that
appears to be a good thing since I was planning to send you the
single mag unit I've been using here repackaged for burial up to
30 inches and with cable connections that match your present
setup. Along with that, I was building a two magnetometer unit to
do comparisons in my location.<br>
<br>
So, I'll reverse course and finish the two mag unit for you. The
magnetometer adapter boards will be the same as you're using now
the only change being the second magnetometer and the termperature
sensor will have different addresses on the i2c bus .... you
access both mags on the same cable. Dave Witten will have to do
some program changes to capture both units but the setup will
provide the best arrangement for comparison of two magnetometers
...... both in the same local temperature and magnetic
environment.<br>
<br>
Jules<br>
<br>
</font><br>
<div class="moz-cite-prefix">On 10/29/2020 1:15 PM, Kim, Hyomin
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAFXoXAWaJ1_6nKgH4oF1=699RtcLaC2ZU_bEw44SZMb7Kq-oLQ@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="ltr">Hi Jules,
<div>Could you please briefly give us an update on how things
go?</div>
<div>I'd like to have at least two sensors so signals can be
compared back to back. </div>
<div><br>
</div>
<div><br>
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style="color:rgb(111,111,111);font-size:13px">Hyomin Kim</strong><br>
<font color="#6f6f6f">Assistant
Professor</font><br>
<font color="#6f6f6f">Physics<br>
</font><font color="#666666">Center
for Solar-Terrestrial Research<br>
Institute for Space Weather
Sciences</font><br>
<font color="#666666"><a
href="mailto:hmkim@njit.edu"
target="_blank"
moz-do-not-send="true">hmkim@njit.edu</a> • <span
style="white-space:nowrap">(973) 596-5704</span><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<br>
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<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Tue, Oct 13, 2020 at 11:33
PM Kim, Hyomin <<a href="mailto:hmkim@njit.edu"
moz-do-not-send="true">hmkim@njit.edu</a>> wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div dir="ltr">Sounds good. Looking forward to it!
<div>We also have to coordinate with Gil or Chris (another
NJIT engineer) who will escort us there. </div>
<div><br>
</div>
<div>Hyomin</div>
<div><br>
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style="color:rgb(111,111,111);font-size:13px">Hyomin Kim</strong><br>
<font color="#6f6f6f">Assistant
Professor</font><br>
<font color="#6f6f6f">Physics<br>
</font><font color="#666666">Center
for Solar-Terrestrial Research<br>
Institute for Space Weather
Sciences</font><br>
<font color="#666666"><a
href="mailto:hmkim@njit.edu"
target="_blank"
moz-do-not-send="true">hmkim@njit.edu</a> • <span
style="white-space:nowrap">(973) 596-5704</span><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<br>
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<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Tue, Oct 13, 2020 at
8:40 PM Julius Madey <<a
href="mailto:hillfox@fairpoint.net" target="_blank"
moz-do-not-send="true">hillfox@fairpoint.net</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div> <font face="Arial">I think that would work. Have
to finish some assembly here and then come up with a
schedule.<br>
Jules<br>
</font><br>
<div>On 10/13/2020 5:13 PM, Dr. Nathaniel A. Frissell
Ph.D. wrote:<br>
</div>
<blockquote type="cite">
<div>
<p class="MsoNormal">Hi Hyomin and Jules,</p>
<p class="MsoNormal"> </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.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">73 de Nathaniel</p>
<p class="MsoNormal"> </p>
<div
style="border-right:none;border-bottom:none;border-left:none;border-top:1pt
solid rgb(225,225,225);padding:3pt 0in 0in">
<p class="MsoNormal"><b>From:</b> Kim, Hyomin <a
href="mailto:hmkim@njit.edu" target="_blank"
moz-do-not-send="true"><hmkim@njit.edu></a>
<br>
<b>Sent:</b> Tuesday, October 13, 2020 5:02 PM<br>
<b>To:</b> Julius Madey <a
href="mailto:hillfox@fairpoint.net"
target="_blank" moz-do-not-send="true"><hillfox@fairpoint.net></a><br>
<b>Cc:</b> TAPR TangerineSDR Modular Software
Defined Radio <a
href="mailto:tangerinesdr@lists.tapr.org"
target="_blank" moz-do-not-send="true"><tangerinesdr@lists.tapr.org></a>;
John Gibbons <a href="mailto:jcg66@case.edu"
target="_blank" moz-do-not-send="true"><jcg66@case.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><br>
<b>Subject:</b> Re: [TangerineSDR] Fwd: another
24hour RM3100 run and comparison with
Fredericksburg</p>
</div>
<p class="MsoNormal"> </p>
<div>
<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!</p>
<div>
<p class="MsoNormal"> </p>
</div>
<div>
<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. </p>
</div>
<div>
<p class="MsoNormal"> </p>
</div>
<div>
<p class="MsoNormal">Sorry for my slow response.
I am quite swamped by my teaching workload
this semester (somewhat unexpected...). </p>
</div>
<div>
<p class="MsoNormal"> </p>
</div>
<div>
<p class="MsoNormal">Cheers,</p>
</div>
<div>
<p class="MsoNormal">Hyomin</p>
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<p class="MsoNormal"
style="line-height:12pt"><strong><span
style="font-size:10pt;font-family:Arial,sans-serif;color:rgb(111,111,111)">Hyomin
Kim</span></strong><span
style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(35,38,54)"><br>
</span><span
style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(111,111,111)">Assistant
Professor</span><span
style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(35,38,54)"><br>
</span><span
style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(111,111,111)">Physics<br>
</span><span
style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(102,102,102)">Center
for
Solar-Terrestrial
Research<br>
Institute for
Space Weather
Sciences</span><span
style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(35,38,54)"><br>
</span><span
style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(102,102,102)"><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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<div>
<p class="MsoNormal">On Mon, Oct 5, 2020 at 6:07
PM Julius Madey <<a
href="mailto:hillfox@fairpoint.net"
target="_blank" moz-do-not-send="true">hillfox@fairpoint.net</a>>
wrote:</p>
</div>
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<div>
<p class="MsoNormal"
style="margin-bottom:12pt"><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></p>
<div>
<p class="MsoNormal">On 10/5/2020 5:31 PM,
Kim, Hyomin wrote:</p>
</div>
<blockquote
style="margin-top:5pt;margin-bottom:5pt">
<div>
<div>
<p class="MsoNormal">Hi Dave, Jules and
Nathaniel,</p>
</div>
<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. </p>
</div>
<div>
<p class="MsoNormal"> </p>
</div>
<div>
<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...</p>
</div>
<div>
<p class="MsoNormal"> </p>
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<div>
<p class="MsoNormal">Hyomin</p>
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class="MsoNormal"><a
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<p
class="MsoNormal"
style="line-height:12pt"><strong><span
style="font-size:10pt;font-family:Arial,sans-serif;color:rgb(111,111,111)">Hyomin
Kim</span></strong><span
style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(35,38,54)"><br>
</span><span
style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(111,111,111)">Assistant
Professor</span><span
style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(35,38,54)"><br>
</span><span
style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(111,111,111)">Physics<br>
</span><span
style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(102,102,102)">Center
for
Solar-Terrestrial
Research<br>
Institute for
Space Weather
Sciences</span><span
style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(35,38,54)"><br>
</span><span
style="font-size:9pt;font-family:Arial,sans-serif;color:rgb(102,102,102)"><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:9pt;font-family:Arial,sans-serif;color:rgb(35,38,54)"></span></p>
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<div>
<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:</p>
</div>
<blockquote
style="border-top:none;border-right:none;border-bottom:none;border-left:1pt
solid rgb(204,204,204);padding:0in 0in
0in
6pt;margin-left:4.8pt;margin-right:0in">
<div>
<p class="MsoNormal"
style="margin-bottom:12pt"><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></p>
<div>
<p class="MsoNormal">On 9/22/2020
7:52 PM, John Gibbons wrote:</p>
</div>
<blockquote
style="margin-top:5pt;margin-bottom:5pt">
<div>
<div>
<p class="MsoNormal"><span
style="font-size:12pt;font-family:Arial,sans-serif;color:black">All,</span></p>
</div>
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<p class="MsoNormal"><span
style="font-size:12pt;font-family:Arial,sans-serif;color:black"> </span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:12pt;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).</span></p>
</div>
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<p class="MsoNormal"><span
style="font-size:12pt;font-family:Arial,sans-serif;color:black"> </span></p>
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<div>
<p class="MsoNormal"><span
style="font-size:12pt;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.</span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:12pt;font-family:Arial,sans-serif;color:black"> </span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:12pt;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?</span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:12pt;font-family:Arial,sans-serif;color:black"> </span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:12pt;font-family:Arial,sans-serif;color:black">John
N8OBJ</span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:12pt;font-family:Arial,sans-serif;color:black"> </span></p>
</div>
<div>
<div>
<div>
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<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<p
class="MsoNormal">John
C. Gibbons</p>
</div>
<p
class="MsoNormal">Director
- Sears
Undergraduate
Design
Laboratory</p>
</div>
<p
class="MsoNormal">Dept.
of Electrical
Engineering
and Computer
Science</p>
</div>
</div>
<p
class="MsoNormal">Case
Western
Reserve
University </p>
</div>
<div>
<p
class="MsoNormal">10900
Euclid Ave, <span
style="font-size:9.5pt">Glennan 314</span></p>
</div>
</div>
<div>
<p
class="MsoNormal"
style="margin-bottom:12pt"><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:rgb(17,85,204)">(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
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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:rgb(17,85,204)">jcg66@case.edu</span></a></p>
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</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<p class="MsoNormal"> </p>
</div>
<p class="MsoNormal"> </p>
<div>
<div>
<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:</p>
</div>
<blockquote
style="border-top:none;border-right:none;border-bottom:none;border-left:1pt
solid
rgb(204,204,204);padding:0in 0in
0in
6pt;margin-left:4.8pt;margin-right:0in">
<div>
<p class="MsoNormal"
style="margin-bottom:12pt"><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></p>
<div>
<p class="MsoNormal">On
9/15/2020 10:38 AM, Phil
Erickson wrote:</p>
</div>
<blockquote
style="margin-top:5pt;margin-bottom:5pt">
<div>
<p class="MsoNormal">Hi
Dave, </p>
<div>
<p class="MsoNormal"> </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.</p>
</div>
<div>
<p class="MsoNormal"> </p>
</div>
<div>
<p class="MsoNormal">73</p>
</div>
<div>
<p class="MsoNormal">Phil
W1PJE</p>
</div>
<div>
<p class="MsoNormal"> </p>
</div>
<div>
<p class="MsoNormal"> </p>
</div>
</div>
<p class="MsoNormal"> </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:</p>
</div>
<blockquote
style="border-top:none;border-right:none;border-bottom:none;border-left:1pt
solid
rgb(204,204,204);padding:0in
0in 0in
6pt;margin-left:4.8pt;margin-right:0in">
<div>
<p class="MsoNormal">@Phil,
</p>
<div>
<p class="MsoNormal"> </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)</p>
</div>
<div>
<p class="MsoNormal"> </p>
</div>
<div>
<p class="MsoNormal">Dave
Witten, KD0EAG</p>
</div>
</div>
<p class="MsoNormal"> </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:</p>
</div>
<blockquote
style="border-top:none;border-right:none;border-bottom:none;border-left:1pt
solid
rgb(204,204,204);padding:0in
0in 0in
6pt;margin-left:4.8pt;margin-right:0in">
<div>
<p
class="MsoNormal">Hi
all,</p>
<div>
<p
class="MsoNormal"> </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?</p>
</div>
<div>
<p
class="MsoNormal"> </p>
</div>
<div>
<p
class="MsoNormal">73</p>
</div>
<div>
<p
class="MsoNormal">Phil
W1PJE</p>
</div>
</div>
<p class="MsoNormal"> </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:</p>
</div>
<blockquote
style="border-top:none;border-right:none;border-bottom:none;border-left:1pt
solid
rgb(204,204,204);padding:0in
0in 0in
6pt;margin-left:4.8pt;margin-right:0in">
<div>
<p
class="MsoNormal"
style="margin-bottom:12pt">I don't believe that my previous post carried
the file K2KGJ
provided.</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>></p>
</div>
<p
class="MsoNormal"
style="margin-bottom:12pt"> </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></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>
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</blockquote>
</div>
<p class="MsoNormal"><br
clear="all">
</p>
<div>
<p
class="MsoNormal"> </p>
</div>
<p class="MsoNormal">--
</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></p>
</div>
</blockquote>
</div>
</blockquote>
</div>
<p class="MsoNormal"><br
clear="all">
</p>
<div>
<p class="MsoNormal"> </p>
</div>
<p class="MsoNormal">-- </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></p>
</div>
</blockquote>
<p class="MsoNormal"> </p>
</div>
<p class="MsoNormal">-- <br>
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