[TangerineSDR] Fwd: another 24hour RM3100 run and comparison with Fredericksburg

David Witten wittend at wwrinc.com
Tue Sep 15 10:34:11 EDT 2020


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)

Dave Witten, KD0EAG

On Tue, Sep 15, 2020 at 7:21 AM Phil Erickson <phil.erickson at gmail.com>

> Hi all,
>   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?
> 73
> Phil W1PJE
> On Mon, Sep 14, 2020 at 10:49 PM David Witten via TangerineSDR <
> tangerinesdr at lists.tapr.org> wrote:
>> I don't believe that my previous post carried the file K2KGJ provided.
>> ---------- Forwarded message ---------
>> From: Julius Madey <hillfox at fairpoint.net>
>> Date: Mon, Sep 14, 2020 at 4:26 PM
>> Subject: another 24hour RM3100 run and comparison with Fredericksburg
>> To: Kim, Hyomin <hmkim at njit.edu>, David Witten <wittend at wwrinc.com>, Dr.
>> Nathaniel A. Frissell Ph.D. <nathaniel.frissell at scranton.edu>, Dave
>> Larsen <kv0s.dave at gmail.com>
>> All,
>> 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.
>> The vertical axes scales on all plots are as close as I could match them
>> by eye in cutting and pasting.
>> 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.
>> 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.
>> Jules - K2KGJ
>> --
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> --
> ----
> Phil Erickson
> phil.erickson at gmail.com
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