Topic: Metop-B SEM TED Proton Bias Voltage Increase

Date/Time Issued: May 18, 2019 0055Z

Product(s) or Data Impacted: SEM Products

Date/Time of Initial Impact: May 16, 2019 1229 UTC

Impacts on Users and Significance: SEM products are affected.

Date/Time of Expected End: N/A

Length of Outage: N/A

Details/Specifics of Change:

Metop-B SEM TED proton bias voltage will be increased to level 5. This periodic change in the bias voltage is part of the normal operations of SEM and is not an indication of any problems. As the detectors age, it is important to increase the bias voltage to compensate for reduced sensitivity. This increase will improve the performance of the SEM TED sensors.

Contact Information for Further Information: ESPC Operations at at 301-817-3880 and/or other contacts as necessary

Web Site(s) for applicable information: N/A

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