On February 22, 2022 (2022/053), Aqua FOT reported data losses occuring at regular intervals from MODIS and AIRS science data. The data errors were determined to be due to the solid-state recorder (SSR) where a particular area of memory had failed. The recovery of operations involved marking the area in memory as unusable and resetting the SSR and Formatter/Multiplexer Unit (FMU). The reset was performed on March 23, 2022 and MODIS returned to nominal operation later that day (2022/082 19:47:31).
The MODIS instrument onboard the Terra spacecraft reported a reset of its command and format processors on March 15, 2022 (2022/074 @08:54z). Analysis has shown this was a single-event upset (SEU). The recovery efforts included uploading several patches to the MODIS formatter to return the instrument to its pre-reset configuration. The required patches were uploaded from March 15-17th. As of March 17, 2022 (2022/076 @02:19:04) MODIS was restored to its nominal configuration.
The commanded pitch of the Aqua spacecraft to allow for a deep space calibration including the Moon was completed on September 24, 2021. The MODIS instrument successfully viewed the moon through its earth view (EV) port. MCST monitored the instrument health throughout the maneuver and continues to monitor telemetry. Analysis of the calibration is ongoing.
Terra flight operations successfully reset the spacecraft solid state recorder (SSR) on September 22, 2021. Among other benefits, this reset returns the Terra MODIS onboard data storage to its full capacity. For more information see the article on the NASA EOS Terra website here.
MCST is preparing for an Aqua lunar deep space calibration (LDSC) on 2021/266 (September 23, 2021). This spacecraft pitch maneuver will allow MODIS to view the Moon through the EV port. In order to facilitate this maneuver, there will be outages of science data in the approximate range of 0900-11:00z. The maneuver will also affect the temperature of the MODIS cold focal planes, which may take ~20 hours to stabilize post-maneuver.
MODIS Characterization Support Team
The MODIS Characterization Support Team (MCST) is dedicated to the production of a high quality MODIS calibration product. This product is a precursor to every geophysical science product. MCST works for the Science Team Leader and is responsible for developing and maintaining the calibration product (L1B algorithm).
Collection 6 has been under development for a number of years. MCST, in consultation with representatives of the science disciplines, developed improvements to the calibration algorithms and methodolgies to handle known issues with the aging MODIS sensors. Summary talks of the proposed Collection 6 changes have been delivered at the MODIS science team meetings over the last few years.