On 02.18.16 (2016.049) the Terra spacecraft entered safe mode on DOY 049 at 1433z. Terra MODIS was transitioned to science mode on Feb 24, 2016 (day 055) after being in safe mode since Feb 18, 2016 (day 049). Though the data is currently being acquired and processed at MODAPS and NRT, users are advised to exercise caution in using the products in any application. Products from DOY 055 to 058 might have been severely degraded due to abnormal operating temperature for the SWIR and LWIR FPA and hence products may not be usable in any application. Though the focal plane temperatures have reached the stable operating value as of day 059 some products may still have been impacted by the increased noise in some of the detectors in the thermal bands. Users are requested to exercise caution in using the products until further notice.

NOTE (Current Status): Terra MODIS has returned to science mode operation on Feb 24, 2016 following transition of the satellite and instrument to SAFE-HOLD on Feb 18. MODAPS started processing of Terra MODIS on March 07, 2016. Data from day 2016059 and onwards is being processed. No instrument data is available for days 049 through 55 and data not usable for day 055 through 058, the period 2/24 through 2/27 (focal planes had not reached the operational temperature). All land data products from the post safe-hold period are expected to be of nominal quality, however n-day products with time periods overlapping the period of 050 - 058 would be degraded from use of less than normal number of input days.



Below is an example of the comparison for the MOD17A2-Gross Primary Productivity 8-Day L4 Global 1km on day 2016.057, and 073. Due to the safe mode period, The DOY 057 product was run with less than expected number of days as input, resulting in lower than normal productivity on a global scale when compared to DOY 073.

Occurrence: L1B data and all downstream products for the times specified above.

PGE:

Case Name: PM_MOD_16049