<div dir="ltr">Frequent Y-axis offset is not surprising as X and Y are quite susceptible to geospace environment. Of course, the Z axis not being well leveled is a different story. <div><br></div><div><br></div><div><br clear="all"><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><table style="border-collapse:collapse;width:525px;border-spacing:0px;background-color:transparent;color:rgb(35,38,54);font-family:Poppins,sans-serif;font-size:16px"><tbody style="border:0px;padding:0px;font-size:0.9em"><tr><td style="padding:5px;font-size:0.9em;font-stretch:normal;line-height:1.5;color:rgb(255,0,0);border-width:0px 3px 0px 0px;border-bottom-style:initial;border-bottom-color:initial;border-top-style:initial;border-right-style:solid;border-left-style:initial;border-top-color:initial;border-right-color:rgb(204,0,0);border-left-color:initial;width:180px;vertical-align:middle"><a href="https://www.njit.edu/" style="background-color:transparent;color:rgb(51,122,183)" target="_blank"><img src="https://assets.njit.edu/uicomponents/NJIT-email-logo.png" alt="NJIT logo" style="border:0px;display:block;vertical-align:middle;width:150px;height:auto;max-width:150px"></a></td><td style="padding:5px 5px 5px 10px;font-size:12px;font-stretch:normal;line-height:16px;border:0px;font-family:Arial,Helvetica,sans-serif"><strong 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">hmkim@njit.edu</a> • <span style="white-space:nowrap">(973) 596-5704</span><br><a href="https://web.njit.edu/~hmkim/" target="_blank">https://web.njit.edu/~hmkim/</a><br>104 Tiernan Hall, 161 Warren Street, Newark, NJ 07102<br></font></td></tr></tbody></table></div></div></div></div></div></div></div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Sep 15, 2020 at 3:20 PM Julius Madey <<a href="mailto:hillfox@fairpoint.net">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">Hyomin, that's good news. I know you've been
busy. I also have to check alignment of the in ground RM3100;
the PVC pipe may have shifted slightly as the soil around it
settles. When first installed, the Yaxis was almost zero but is
now a bit off; the Z axis may be slightly off as well ...
alignment was using a spirit level on a machinist's square.<br>
<br>
</font><br>
<div>On 9/15/2020 1:24 PM, Kim, Hyomin
wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">Jules - the mag is under test at this moment.
Hopefully, I can give some updates soon.
<div><br>
</div>
<div><br>
</div>
<div><br clear="all">
<div>
<div dir="ltr">
<div dir="ltr">
<div>
<div dir="ltr">
<div>
<div dir="ltr">
<div>
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<td style="padding:5px 5px 5px 10px;font-size:12px;font-stretch:normal;line-height:16px;border:0px;font-family:Arial,Helvetica,sans-serif"><strong 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">hmkim@njit.edu</a> • <span style="white-space:nowrap">(973) 596-5704</span><br>
<a href="https://web.njit.edu/~hmkim/" target="_blank">https://web.njit.edu/~hmkim/</a><br>
104 Tiernan Hall, 161 Warren
Street, Newark, NJ 07102<br>
</font></td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<br>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Tue, Sep 15, 2020 at 12:43
PM Julius Madey <<a href="mailto:hillfox@fairpoint.net" target="_blank">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">The Z axis reading is high relative
to the Z axis value of 48,032.0nT from the World Magnetic
Model for that day for my specific location of 42deg 15min
41.24sec North, 73deg 32min 32.43sec West, 1220 ft
elevation. <br>
<br>
Hyomin, have you had time to complete the solenoid coil
measurement of the RM3100?<br>
<br>
Jules - K2KGJ<br>
<br>
</font><br>
<div>On 9/15/2020 11:58 AM, Kim, Hyomin wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">Just to add to Phil's comments, what I see
from the Z axis (if I am not wrong), is that there is a
drift (whether real or not) in our Z axis data: for
example, Bz in the USGS mag began at ~0 nT and ended at
~0 nT whereas ours began at ~49980 nT and ended at 50000
nT, which is a 20 nT increase.
<div><br>
</div>
<div><br>
</div>
<div><br clear="all">
<div>
<div dir="ltr">
<div dir="ltr">
<div>
<div dir="ltr">
<div>
<div dir="ltr">
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<table style="border-collapse:collapse;width:525px;border-spacing:0px;background-color:transparent;color:rgb(35,38,54);font-family:Poppins,sans-serif;font-size:16px">
<tbody style="border:0px;padding:0px;font-size:0.9em">
<tr>
<td style="padding:5px;font-size:0.9em;font-stretch:normal;line-height:1.5;color:rgb(255,0,0);border-width:0px 3px 0px 0px;border-bottom-style:initial;border-bottom-color:initial;border-top-style:initial;border-right-style:solid;border-left-style:initial;border-top-color:initial;border-right-color:rgb(204,0,0);border-left-color:initial;width:180px;vertical-align:middle"><a href="https://www.njit.edu/" style="background-color:transparent;color:rgb(51,122,183)" target="_blank"><img src="https://assets.njit.edu/uicomponents/NJIT-email-logo.png" alt="NJIT
logo" style="border: 0px; display: block; vertical-align: middle; width: 150px; height: auto; max-width: 150px;"></a></td>
<td style="padding:5px 5px 5px 10px;font-size:12px;font-stretch:normal;line-height:16px;border:0px;font-family:Arial,Helvetica,sans-serif"><strong 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">hmkim@njit.edu</a> • <span style="white-space:nowrap">(973) 596-5704</span><br>
<a href="https://web.njit.edu/~hmkim/" target="_blank">https://web.njit.edu/~hmkim/</a><br>
104 Tiernan Hall, 161
Warren Street, Newark, NJ
07102<br>
</font></td>
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</tbody>
</table>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<br>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Tue, Sep 15, 2020
at 11:53 AM Phil Erickson <<a href="mailto:phil.erickson@gmail.com" target="_blank">phil.erickson@gmail.com</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">Hi David,
<div><br>
</div>
<div> When I say "secular change", I meant the time
scale of the change. Secular = long term, in this
case relative to the time scales of a magnetic
disturbance. For example, storm time current
variations might occur on a few minute to hour or
two scale, but would not last for 24 hours. The
latter is what I was referring to and indicates a
more long term drift. If you saw that drift for
example from day to day, that is now climatology
(not weather) and you would have to see whether
that is reasonable geophysically.</div>
<div><br>
</div>
<div>73</div>
<div>Phil</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Tue, Sep 15,
2020 at 11:50 AM David Witten <<a href="mailto:wittend@wwrinc.com" target="_blank">wittend@wwrinc.com</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">Phil, Hyomin,
<div><br>
</div>
<div>I believe that I understand your comments,
but to be sure, may I ask exactly what is
meant by 'secular change'. I do not want to
make incorrect assumptions about a term of
art.</div>
<div><br>
</div>
<div>Dave</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Tue, Sep
15, 2020 at 10:45 AM Phil Erickson <<a href="mailto:phil.erickson@gmail.com" target="_blank">phil.erickson@gmail.com</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">If it is picking up a 10 nT
level secular change, that is fabulous for a
reasonable cost sensor! Maybe Jules has a
ground induced current nearby? Anyhow,
temperature sensitivity at a more precise
level is I'm sure all part of the
calibration needs, so we'll find out
later...
<div><br>
</div>
<div>Phil</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Tue,
Sep 15, 2020 at 11:40 AM Kim, Hyomin <<a href="mailto:hmkim@njit.edu" target="_blank">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">Ah, yes I agree - the
secular change seems to be a little off.
I paid more attention to the small scale
variations which look to be
similar. This is a mystery to me. Maybe
our sensor is not so precisely
calibrated, say, to ambient temperature
or something? Or we found another
magnetic anomaly near where Jules
lives!!
<div><br>
</div>
<div>
<div><br>
</div>
<div>
<div>
<div>
<div dir="ltr">
<div dir="ltr">
<div>
<div dir="ltr">
<div>
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<tbody style="border:0px;padding:0px;font-size:0.9em">
<tr>
<td style="padding:5px;font-size:0.9em;font-stretch:normal;line-height:1.5;color:rgb(255,0,0);border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(204,0,0);width:180px;vertical-align:middle"><a href="https://www.njit.edu/" style="background-color:transparent;color:rgb(51,122,183)" target="_blank"><img src="https://assets.njit.edu/uicomponents/NJIT-email-logo.png" alt="NJIT
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<td style="padding:5px 5px 5px 10px;font-size:12px;font-stretch:normal;line-height:16px;border:0px;font-family:Arial,Helvetica,sans-serif"><strong 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">hmkim@njit.edu</a> • <span style="white-space:nowrap">(973) 596-5704</span><br>
<a href="https://web.njit.edu/~hmkim/" target="_blank">https://web.njit.edu/~hmkim/</a><br>
104 Tiernan
Hall, 161
Warren Street,
Newark, NJ
07102<br>
</font></td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<br>
</div>
</div>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On
Tue, Sep 15, 2020 at 11:34 AM Phil
Erickson <<a href="mailto:phil.erickson@gmail.com" target="_blank">phil.erickson@gmail.com</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">Hi Hyomin,
<div><br>
</div>
<div> You have a more expert eye
than I do, so I read your
statements as "uncalibrated axes",
which of course is entirely
correct for this RM3100 data. I
just don't know how to separate
the geophysical (latitudinal
difference) from the instrumental
(positional axes are not exactly
the same). I was reacting mostly
to the 24 hour secular change in
each component. Is it reasonable
to assume that is much less
sensitive for horizontal vs
vertical components?</div>
<div><br>
</div>
<div>73</div>
<div>Phil</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On
Tue, Sep 15, 2020 at 11:27 AM Kim,
Hyomin <<a href="mailto:hmkim@njit.edu" target="_blank">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">Hi Phil,
<div>At a first glance I thought
the Z traces matched well as
the relative values appear to
be similar in that axis. If I
am not wrong, Bz is oriented
toward the center of the earth
for the USGS mags. I believe
the USGS mag is quite
precisely oriented whereas our
mag is not. Thus any slight
offset in orientation can be
seen noticeably as Bz has the
biggest values? Also, the
latitudinal difference between
his place and Fredericksburg
could be another factor? </div>
<div><br>
</div>
<div>Hyomin</div>
<div><br clear="all">
<div>
<div dir="ltr">
<div dir="ltr">
<div>
<div dir="ltr">
<div>
<div dir="ltr">
<div>
<div dir="ltr">
<table style="border-collapse:collapse;width:525px;border-spacing:0px;background-color:transparent;color:rgb(35,38,54);font-family:Poppins,sans-serif;font-size:16px">
<tbody style="border:0px;padding:0px;font-size:0.9em">
<tr>
<td style="padding:5px;font-size:0.9em;font-stretch:normal;line-height:1.5;color:rgb(255,0,0);border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(204,0,0);width:180px;vertical-align:middle"><a href="https://www.njit.edu/" style="background-color:transparent;color:rgb(51,122,183)" target="_blank"><img src="https://assets.njit.edu/uicomponents/NJIT-email-logo.png" alt="NJIT
logo" style="border: 0px; display: block; vertical-align: middle; width: 150px; height: auto; max-width: 150px;"></a></td>
<td style="padding:5px 5px 5px 10px;font-size:12px;font-stretch:normal;line-height:16px;border:0px;font-family:Arial,Helvetica,sans-serif"><strong 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">hmkim@njit.edu</a> • <span style="white-space:nowrap">(973) 596-5704</span><br>
<a href="https://web.njit.edu/~hmkim/" target="_blank">https://web.njit.edu/~hmkim/</a><br>
104 Tiernan
Hall, 161
Warren Street,
Newark, NJ
07102<br>
</font></td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<br>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Tue, Sep
15, 2020 at 10:39 AM Phil
Erickson via TangerineSDR <<a href="mailto:tangerinesdr@lists.tapr.org" target="_blank">tangerinesdr@lists.tapr.org</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">Hi Dave,
<div><br>
</div>
<div> 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.</div>
<div><br>
</div>
<div>73<br>
</div>
<div>Phil W1PJE</div>
<div><br>
</div>
<div><br>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Tue,
Sep 15, 2020 at 10:34 AM
David Witten <<a href="mailto:wittend@wwrinc.com" target="_blank">wittend@wwrinc.com</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">@Phil,
<div><br>
</div>
<div>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)<br>
</div>
<div><br>
</div>
<div>Dave Witten, KD0EAG</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On
Tue, Sep 15, 2020 at
7:21 AM Phil Erickson
<<a href="mailto:phil.erickson@gmail.com" target="_blank">phil.erickson@gmail.com</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">Hi all,<br>
<div><br>
</div>
<div> 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?</div>
<div><br>
</div>
<div>73</div>
<div>Phil W1PJE</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On
Mon, Sep 14, 2020
at 10:49 PM David
Witten via
TangerineSDR <<a href="mailto:tangerinesdr@lists.tapr.org" target="_blank">tangerinesdr@lists.tapr.org</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">I
don't believe
that my previous
post carried the
file K2KGJ
provided.<br>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">---------- Forwarded message ---------<br>
From: <strong class="gmail_sendername" dir="auto">Julius Madey</strong> <span dir="auto"><<a href="mailto:hillfox@fairpoint.net" target="_blank">hillfox@fairpoint.net</a>></span><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">hmkim@njit.edu</a>>,
David Witten
<<a href="mailto:wittend@wwrinc.com" target="_blank">wittend@wwrinc.com</a>>, Dr.
Nathaniel A.
Frissell Ph.D.
<<a href="mailto:nathaniel.frissell@scranton.edu" target="_blank">nathaniel.frissell@scranton.edu</a>>,
Dave Larsen
<<a href="mailto:kv0s.dave@gmail.com" target="_blank">kv0s.dave@gmail.com</a>><br>
</div>
<br>
<br>
<div> <font face="Arial">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<br>
</font> </div>
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