An anomaly with the Terra Moderate Resolution Imaging Spectroradiometer (MODIS) Global Positioning System (GPS), which started at approximately 23:00:00 UTC on May 11, 2024, caused a significant degradation in geolocation performance for Terra MODIS data. The behavior was likely due to the strong solar storm from that weekend. At approximately 16:29:55 UTC on May 12, 2024, the position and velocity covariances returned within tolerance for the Terra Instrument to transition back to real time operations. Given this degradation, all production of Level 1-3 daily Terra MODIS and Combined MODIS data for May 11-12 (DOY 132-133) have been removed and reprocessed. All 8- and 16-day products for May 9, 2024 (DOY 129) have been replaced as well. Users are advised not to use any Terra MODIS or Combined MODIS data for the dates above that were download prior to June 1, 2024.
Users should be aware that Level 2 Terra Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) data products utilize MODIS inputs and are advised not to use any Level 2 Terra ASTER data for May 11-12, 2024, ordered prior to June 1, 2024.
Please contact the Land Processes Distributed Active Archive Center (LP DAAC) User Services team with any questions.