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Case #:PM_MYD_20229a   Opening date: 08/17/2020   Last update: 11/02/2020
Status: Note
Aqua MODIS suffered a science data outage, starting August 16th, 2020 (2020.229) at 09:26:40, because of a FMU/SSR error, the details of which can be found here. The Aqua Flight Operations Team (FOT) worked closely with the different Instrument Operations Teams (IOTs) to resolve this and was able to recover the FMU/SSR, through a soft-reset on September 2, 21:00. During the entire data outage duration MODIS on-board Aqua was in good health acquiring science quality data as verified by the direct broadcast stations and during the reset process, MODIS was held in standby mode.

Following the reset on September 2 at 21:00, MODIS resumed nominal science data collection at 20:12 UTC. MODIS standard processing stream at MODAPS and the NRT processing streams successfully processed Aqua MODIS data. MODIS Calibration Support Team verified the RSB and TEB gain trending to be free of any impact from FMU anomaly, and the NASA MODIS geolocation team verified the geolocation accuracy to be nominal. All Aqua MODIS land and atmosphere products have been found to be satisfactory.

The level 0 data currently though not available for the anomaly period, EDOS is expected to coordinate recovery of the data for this period using the data received by the various Direct Broadcast (DB) stations. As it may take some time to receive and process DB data, to support data users near time needs MODAPS plans to generate the MODIS Terra+Aqua combined products using the Terra only data for the anomaly period (8/16 - 9/2) and later reprocess these products using the available Aqua MODIS data when data from DB stations become available for processing. The following plan has been proposed by the MODIS Land Team and LDOPE/MODAPS to resume the production of the Terra+Aqua MODIS combined land products as well as the MxD11 suite of LST products, from the anomaly period (8/16 - 9/2) :

**** Update 11/02/2020: ****

MODAPS has started to re-processing this Aqua FMU outage period (8/16 - 9/2), based on limited L0 coverage received from the various Direct Broadcast (DB) stations, via EDOS. The data from the DB stations are expected to cover between 25-30% of the globe each day. The status of this re-processing, as of 11/02/2020 is as follows:

1. All Aqua specific L2 and L3 dailies, for this outage period have now been re-processed in C6 forward production and the data should be available from the different DAACs.
2. The different Aqua specific n-day products are currently under review and once approved by LDOPE and the science teams, even those will be re-processed in C6 forward production.
3. Following #2, all Terra+Aqua combined products will be re-processed for this period and will be released to users, pending review and approval. Please note that at present, all the combined products, including the MCD43*, MCD18*, MCD19*, MCD15A2/A3, have been produced with Terra only inputs.

The images below from 2020-08-16 shows the extent of global coverage that is to be expected from these L0 data that have been received from the Direct Broadcast stations. In general, N. America, Europe and the Indian sub-continent shows the most consistent coverage from day to day, with limited coverage over parts of S. America. The coverage over all other areas is pretty erratic or non-existent, during this period.

MYD09, day A2020229 (2020-08-16)
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MYD14-D (Daytime), day A2020229 (2020-08-16)
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MYD14-N (nighttime), day A2020229 (2020-08-16)
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MYD09GA, day A2020229 (2020-08-16)
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Occurrence: All MODIS Aqua products for specified date and time periods in AS C6 and C61.
PGE: All

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