[Geomag-operations] Data disturbance at USGS FRN (Fresno) observatory - February 13, 2018

[Rigler, Erin (Josh)]

USGS Geomag Data Users:

This is a notification of an impending modification to the Fresno
Geomagnetic Observatory (FRN) data.

Geomag Observatory: FRN

Start Date/Time: 02/13/2018 – 16:00:00 UTC

This modification is: planned

NOTES: The fluxgate sensor at the FRN observatory, near Fresno, CA, will be
replaced. This requires a break in real time data continuity, and may
result in a brief interval of corrupted raw data in the archive (this will
be flagged and removed in subsequent definitive processing, as per usual).

More relevant to real-time data users is that certain derived products
cannot be reliably generated until the new instrument has stabilized
magnetically, and several absolute calibration measurements have been
performed over the course of a few days to weeks following this operation.

The table below details the effects and timelines of this modification on
various geomagnetic data and geomagnetic data products.

Product

Effect

Estimated Start Date/Time:

Estimated End Date/Time:

Notes:

Raw

Offsets/Drift/
Disturbance

2/13/2018
16:00 UTC

2/14/2018
01:00 UTC

allow ample time for hardware swap-out

Quasi Definitive

Possible Outage

2/13/2018
16:00 UTC

2/15/2018
01:00 UTC

reliable calibration required

Definitive

Possible Outage

2/13/2018
16:00 UTC

2/15/2018
01:00 UTC

reliable calibration required

Adjusted

Outage

2/13/2018
16:00 UTC

2/20/2018
00:00 UTC

multiple stable calibrations required

XYZ

Offsets

2/13/2018
16:00 UTC

2/20/2018
00:00 UTC

multiple stable calibrations required

SQ

Offsets/
Drift

2/13/2018
16:00 UTC

3/15/2018
00:00 UTC

~30 Day filter within algorithm

SV

Offsets/
Drift

2/13/2018
16:00 UTC

3/15/2018
00:00 UTC

~30 Day filter within algorithm

DIST

Offsets/
Drift

2/13/2018
16:00 UTC

3/15/2018
00:00 UTC

~30 Day filter within algorithm

DST

NA


Not a DST Station

Additional notification will be sent once real-time data products have been
fully restored to normal operation.  Please direct any questions or
concerns to geomag-data at geohazards.usgs.gov.
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