[Geomag-data] USGS Adjusted Geomagnetic Data update for 19-March-2021 (early update)

[Rigler, Erin (Josh) Joshua]

The USGS Geomagnetism Program's Adjusted Data (aka "Provisional" by INTERMAGNET) provides near real time absolutely calibrated and geographically oriented geomagnetic observations. These calibration parameters are updated on the first of each month in order to satisfy geomagnetic observatory standards for accuracy and quality control. Updates are deployed at midnight UTC, and may result in noticeable baseline shifts for observatories whose sensor response characteristics may have changed substantially since the last such update, or in rare cases, whose actual sensor has been altered or replaced since the last update. To view the results of this month's update, go to:

https://geomag.usgs.gov/plots/?timeRangeType=custom&endTime=2021-03-19T00:30:00.000Z&startTime=2021-03-18T23:30:00.000Z&type=adjusted

This is an early update to reactivate the San Juan (SJG) Adjusted data stream. SJG Adjusted data had been offline since December 28th, 2020, after the sensor became mechanically misaligned for unknown reasons. The sensor has been realigned, several "absolute" calibration measurements have been made, and vector transformations into geographic coordinates are once again reliable.

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