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On December 19, 2014, the Landsat 8 Thermal Infrared Sensor (TIRS) was reconfigured due to the detection of anomalous current levels associated with the scene select mirror (SSM) encoder electronics. The SSM electronics have been turned off with the instrument pointed at nadir. Over the upcoming weeks, the calibration/validation team will continue to investigate whether updated calibration parameters can be derived.

Landsat 8 Level 1 data products continue to be generated and contain valid Operational Land Imager (OLI) data; however the TIRS band data will consist of zero-fill and will be unusable at this time.

Please refer to the December 22, 2014 Landsat Mission Headlines for more details: http://landsat.usgs.gov/mission_headlines2014.php.