GRACEFOmissies

GRACEFOmissies is a Dutch-language label used to refer to the Gravity Recovery and Climate Experiment Follow-On (GRACE-FO) mission and its associated observational activities. The GRACE-FO mission is a joint mission of NASA and the German Aerospace Center (DLR) that continues the time-variable mapping of Earth's gravity field initiated by the original GRACE mission. Launched on May 22, 2018, GRACE-FO comprises two identical satellites in near-polar, low-Earth orbit separated by roughly 220 kilometers. The primary measurement is precise tracking of the distance between the satellites using microwave ranging, supplemented by a Laser Ranging Interferometer (LRI) to reduce measurement drift and improve accuracy. From the minute variations in orbit separation and gravity-induced accelerations, GRACE-FO derives monthly gravity field maps and mass-change estimates.

This data supports studies of large-scale hydrology, ice-sheet dynamics, groundwater depletion, and sea-level rise. It also bears on climate variability, natural hazards, and Earth system science. The mission built on the GRACE heritage, continuing a continuous data record of Earth's gravity field since 2002. Data products including gravity field models, mascon mass-change solutions, and drought/water-cycle indicators are distributed to the scientific community via NASA and partner agencies.

As of the mid-2020s the GRACE-FO mission has continued operations with ongoing data releases and user support; its measurements are considered essential for monitoring rapid changes in water storage and land ice.