Opening Date:
2022-09-20
Last update:
2022-10-28
Status:
Note
The initial Terra Constellation Exit Maneuver (CEM) is scheduled for October 12, 2022, around 7:30 am EDT. The CEM will be carried out through two successive maneuvers, on October 12 and 19, respectively. All science data acquisition will remain suspended during, between, and following these two successive maneuvers, for a period of about 10 days, as MODIS will remain in a "CEM configuration" mode between the CEMs, where SV and EV doors will remain closed, Blackbody will be turned off and the SMIR and LWIR focal plane/heaters will be turned off as well. Post CEM, some more time will be needed to bring all instruments back to their nominal status. Post-CEM calibrations will be performed over the following weeks and LUT updates will occur as needed. MODIS data users of both NRT and operational processing streams are requested to take note of this and expect data outage for at least 10 days, starting October 12. This note will be further updated after the event, once all instruments are back to their nominal status and both NRT / operational production has resumed. For further information please reference the related operational processing note.
************************************************
All Terra NRT data production from NASA LANCE has resumed as of October 28th at 00:00, following a prolonged outage because of two successive Constellation Exit Maneuvers (CEM) that were performed on October 12 and 19 respectively. Following the CEMs, the space and nadir view doors were opened on October 21, and the MODIS formatter resumed nominal day/night mode operations from October 22. All instrument temperatures had attained their nominal values by October 23. Assessments carried out by the MODIS validation team now indicates nominal performance and no major cause for concerns, barring slight gain changes that have been noticed for some of the SWIR bands (mainly for Band 5), and possibly slight change in cross-talk behaviors for some of the PV-LWIR detectors.
Users are being warned, not to use any Terra MODIS data products that may be available from nrt3 or nrt4 servers, prior to October 28 (DOY 301) resumption of Terra data from LANCE NRT, as all instrument status and performance may not have been nominal till then.
MODAPS is also expected to resume the operational forward processing of all MODIS Terra products, shortly.
Terra Constellation Exit: UPDATE 10.28.22
************************************************All Terra NRT data production from NASA LANCE has resumed as of October 28th at 00:00, following a prolonged outage because of two successive Constellation Exit Maneuvers (CEM) that were performed on October 12 and 19 respectively. Following the CEMs, the space and nadir view doors were opened on October 21, and the MODIS formatter resumed nominal day/night mode operations from October 22. All instrument temperatures had attained their nominal values by October 23. Assessments carried out by the MODIS validation team now indicates nominal performance and no major cause for concerns, barring slight gain changes that have been noticed for some of the SWIR bands (mainly for Band 5), and possibly slight change in cross-talk behaviors for some of the PV-LWIR detectors.
Users are being warned, not to use any Terra MODIS data products that may be available from nrt3 or nrt4 servers, prior to October 28 (DOY 301) resumption of Terra data from LANCE NRT, as all instrument status and performance may not have been nominal till then.
MODAPS is also expected to resume the operational forward processing of all MODIS Terra products, shortly.
Occurrence:
TERRA C6 / C61 L1B and all Downstream products for the times listed above.
PGE:
Case Name:
PM_MOD_21264_NRT
