GRACE

GRACE, The Satellite


Gravity Recovery and Climate Experiment was a joint mission of NASA and the
German Aerospace Center. Twin satellites took detailed measurements of Earth’s
gravity field anomalies from its launch in March 2002 to the end of its science
mission in October 2017.  Wikipedia

Start
date: March 17, 2002

GRACE stands for the Gravity Recovery and Climate Experiment and was a part of the international Earth Observing System (EOS) series of satellites. The GRACE twin satellites, launched 17 March 2002, are making detailed measurements of Earth’s gravity field changes and revolutionizing investigations.

NASA has a pair of satellites called the Gravity Recovery and Climate Experiment (GRACE) mission, which circle the globe in tandem, about 137 miles apart from each other. By taking precise distance measurements between the two satellites, scientists can estimate minute changes in Earth’s gravity field under the satellites. Its strength varies depending on how much mass objects below the orbiters’ flight paths have and how far apart they are. As the satellites pass over mountains, lakes, and groundwater aquifers, the gravity field of each object exerts a small tug on one of the satellites. Scientists can measure the distance between the two satellites down to the width of a human red blood cell, and thereby get an estimate of the change in gravity, and change in mass, of the bodies of water below.

Data from Grace, as well as a separate satellite mission that measures deep soil moisture, is fed to the US Drought Monitor. The satellite monitor revealed that groundwater levels are being depleted in the US and in other parts of the world. The western drought and its effects are now visible from space.

In more than 15 years of operations, the GRACE satellite mission revolutionized our view of how water moves and is stored on Earth. GRACE measured changes in …

https://www.pv-magazine.com/2020/12/09/grace-solar-links-six-strings-per-motor-linkage-tracker-system/

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