GRACE (Gravity Recovery and Climate Experiment) mission is a joint project between the National Aeronautics and Space Administration (NASA) and Deutsches Zentrum für Luft- und Raumfahrt (DLR). The twin satellites were built by Astrium and launched together with a Rockot in 2002, the mission is operated by the German Satellite Operations Centre and after ten years the mission is still producing outstanding results.
The primary science objective of GRACE is to measure the Earth's gravity field and it's time variability with unprecedented accuracy. The secondary science objective is to obtain approximately 150 very precise globally distributed vertical temperature and humidity profiles of the atmosphere per day using the GPS radio occultation technique.
The GRACE-A and -B Microwave Assemblies (MWA) and Accelerometer Instrument Control Units (ICU) have been switched-on again on:
The GRACE-A and -B Microwave Assemblies (MWA) and Accelerometer Instrument Control Units (ICU) were switched-off on:
Both activities are related to battery load reduction.
Mission Status and Data
The GRACE Level 1B and Level 2 science data and corresponding documentation is publicly available at the two GRACE archives:
Mission Facts and Figures
Related Data Types
Related (Key) Documentation