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<div>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:
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<div><a href="https://geomag.usgs.gov/plots/?timeRangeType=custom&endTime=2021-03-19T00:30:00.000Z&startTime=2021-03-18T23:30:00.000Z&type=adjusted" title="https://geomag.usgs.gov/plots/?timeRangeType=custom&endTime=2021-03-19T00:30:00.000Z&startTime=2021-03-18T23:30:00.000Z&type=adjusted">https://geomag.usgs.gov/plots/?timeRangeType=custom&endTime=2021-03-19T00:30:00.000Z&startTime=2021-03-18T23:30:00.000Z&type=adjusted</a></div>
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<div><b>This is an early update to reactivate the San Juan (SJG) Adjusted data stream</b>. SJG
<i>Adjusted data</i> 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. <br>
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